knowledge - Recondite key locked another puzzle... - Clue Twenty Nine!

<sub><<---First clue

<---Previous clue</sub>

---

_{A note from @Mithrandir: I have given explicit permission for @Techidiot to post this, and gave him the answer to encode. If you want to post one, ping @Mithrandir in chat and we'll talk.}

---

The door slides open, revealing a dimly-lit - you can't see how - small room, with a short wooden desk and a plastic swivel chair. On the desk is a keypad and several pieces of paper. You pick one of them up. It appears to be a crossword:

ACROSS

1. Los Angeles, operating system(4)
2. Back, if around climbing unfinished odd juice(1)

3. Most of the men within Japanese currency(19)
4. Hollow, idea covering starts newly designed internet(16)
5. Weird, crane following after(11)
9. Hidden strategy, pteropodans follow!(10)
10. Crocodile clipped impala's ends after a time(9)
12. Thousand glasses cover first sample of virus(12)
14. Inside each puzzled trier(2)
15. Ring man(13)
16. Queen and Rook, captured aces capturing time(5)

DOWN

1. First, I became yours in chuckles without hugs(18)
4. It always saw left(8)
6. Completely empty page rust endlessly(3)
7. Endless tale going westwards met en route(17)
8. Gut less month, before unfinished trial(15)
9. Part of ten glands!(6)
11. Incomplete, army starts eliminating novices with one area(7)
13. Clumsy final destination, ends back(14)

Interesting, you think. You pick up the other papers. They appear to be the next stage of the puzzle:

A key for the next part is lost in the crossword above..Find it and go for the next part...

 Nbznv. Jbvknu whtg. Jxqz - Vmpmurjz.

And then...

_ _ _ _ 

---

_{Next clue--->}

Answer

Solutions to the clues

ACROSS

1. Los Angeles, operating system(4)

LA+OS $\rightarrow$ LAOS

2. Back, if around climbing unfinished odd juice(1)

F(IJ)I (Backwards if is fi around, odd juice, unfinished ji, climbing ij) $\rightarrow$ FIJI

3. Most of the men within Japanese currency(19)

YE(ME)N $\rightarrow$ YEMEN

4. Hollow, idea covering starts newly designed internet(16)

I(NDI)A $\rightarrow$ INDIA

5. Weird, crane following after(11)

F+RANCE $\rightarrow$ FRANCE

9. Hidden strategy, pteropodans follow!(10)

strategy, pteropodans $\rightarrow$ EGYPT

10. Crocodile clipped impala's ends after a time(9)

CRO+aT+IA $\rightarrow$ CROATIA

12. Thousand glasses cover first sample of virus(12)

K+O(SOV)O $\rightarrow$ KOSOVO

14. Inside each puzzled trier(2)

E(RITRE)A $\rightarrow$ ERITREA

15. Ring man(13)

O+MAN $\rightarrow$ OMAN

16. Queen and Rook, captured aces capturing time(5)

Q(A(T)A)R $\rightarrow$ QATAR

DOWN

1. First, I became yours in chuckles without hugs(18)

L(IBY)A (Laughs-hugs=LA) $\rightarrow$ LIBYA

4. It always saw left(8)

IT+ALY(always-saw) $\rightarrow$ ITALY

6. Completely empty page rust endlessly(3)

CY(completely empty) + P+RUS $\rightarrow$ CYPRUS

7. Endless tale going westwards met en route(17)

LAT(TAL westwards) + VIA(en route) $\rightarrow$ LATVIA

8. Gut less month, before unfinished trial(15)

AUS(AUGUST-GUT) + TRIA $\rightarrow$ AUSTRIA

9. Part of ten glands!(6)

ten glands $\rightarrow$ ENGLAND

11. Incomplete, army starts eliminating novices with one area(7)

ARM+E+N+I+A $\rightarrow$ ARMENIA

13. Clumsy final destination, ends back(14)

FINLA+ND(DN back) $\rightarrow$ FINLAND

Here's the crossword:

Then, taking the highlighted letters:

In the order given by the 'enumerations' we get -

FIJI F
ERITREA I

CYPRUS R
LAOS S
QATAR T
ENGLAND L
ARMENIA E
ITALY T
CROATIA T
EGYPT E
FRANCE R
KOSOVO S

OMAN O
FINLAND F
AUSTRIA T
INDIA I
LATVIA T
LIBYA L
YEMEN E

FIRSTLETTERSOFTITLE $\rightarrow$ FIRST LETTERS OF TITLE

Applying that, we can get

Using question title: RKLAP, sentence starting with WRONG.
Using Crossword title: WTTGC: 'Right. Nicely done. Next - Tqwtopng.'

The next step is

to visit , recognize that this represent the G4 Nations (thanks @Sp3000) and take the letters at the specified points of their names. This yield the final answer -
Brazil
Germany
Japan
India

The final answer is - LEAD