Mend trite form of damage (9)
I believe the answer is:
detriment
'damage' is the definition.
(I know that detriment is a type of damage)
'mend trite form' is the wordplay.
'form' is an anagram indicator (another form of the letters).
'mend'+'trite'='mendtrite'
'mendtrite' anagrammed gives 'DETRIMENT'.
'of' is the link.
(Other definitions for detriment that I've seen before include "State of being harmed or damaged" , "Possible loss" , "Harm, damage" , "Damage, loss" , "hurt" .)