word - You can order them, and keep them

Each clue gives TWO words, which give a letter; the letters can be combined to form two more words, which share a special property with all of the decoded clues.

1. All of forever. (8)


2. It's big enough to grab! (8)



3. Look at the front face. (7)


4. Merchant awaiting feathers. (6)


5. Mounted when off the boat. (6)


6. Museum air vent. (6)


7. Othello editor. (7)


8. Smart powers of two. (6)

Answer

All of forever. (8)

entirety eternity

It's big enough to grab! (8)

sizeable seizable

Look at the front face. (7)

observe obverse

Merchant awaiting feathers. (6)

trader tarred

Mounted when off the boat. (6)

ahorse ashore

Museum air vent. (6)

Louvre louver

Othello editor. (7)

Reversi reviser

Smart powers of two. (6)

brainy binary

For the final part:

Each answer was a pair of words that were anagrams starting with the same letter. Taking the first letter of each word pair, we get these letters:
E S O T A L R B
Which gives: sortable storable
This refers to the puzzle title "you can order them and keep them"