Finding much worse damage inside, give up (8)
I believe the answer is:
forswear
'give up' is the definition.
(I've seen this before)
'finding much worse damage inside' is the wordplay.
'finding much' becomes 'far' (I can't explain this - if you can you should give a lot more credence to this answer).
'damage' indicates anagramming the letters (I've seen 'damaged' mean this).
'inside' indicates putting letters inside.
'worse' with letters rearranged gives 'orswe'.
'far' enclosing 'orswe' is 'FORSWEAR'.
Can you help me to learn more?
(Other definitions for forswear that I've seen before include "Renounce upon oath - far worse (anag)" , "Agree to do without" , "Reject or disavow" , "Deny on oath" , "Give up" .)