The answer to this riddle has a hole in the middle

Here's an easy riddle I got from a book:

The answer to this riddle has a hole in the middle,
And some have been known to fall in it.

In tennis, it's nothing, but it can be recieved,
And sometimes a person may win it.
Though it's not seen or heard it may yet be percieved,
Like princes or bees it's in clover.
The answer to this riddle has a hole in the middle,
And without it, one cannot start over.

Answer

Heres my guess:

Answer:

Love

Reasoning: The answer to this riddle has a hole in the middle,

the letter o is a hole and in the middle (kind of) of the word love

And some have been known to fall in it.

You can fall in love

In tennis, it's nothing, but it can be recieved,

Love in tennis is 0

And sometimes a person may win it.

You can woo someone and "win their love" from @Matt

Though it's not seen or heard it may yet be percieved,

Not a physical object but can be felt

Like princes or bees it's in clover.

Princes love to be in clover (rich) and bees love to be in clovers (plant)

The answer to this riddle has a hole in the middle,

Same as first line

And without it, one cannot start over.

Over starts with o, which is in the middle of love