Much damaged by the RAF (3)

I believe the answer is:

far

I'm a little stuck... Click here to teach me about this clue!

Here is my best explanation:

'much' is the definition.
(I've seen this in other clues)

'damaged by the raf' is the wordplay.
'raf' anagrams to 'FAR'.
However, I'm not sure how this is indicated.

Can you help me to learn more?