Compound fracture reset (5)
I believe the answer is:
ester
'compound' is the definition.
(ester is a kind of compound)
'fracture reset' is the wordplay.
'fracture' indicates an anagram (I've seen this in other clues).
'reset' is an anagram of 'ESTER'.
(Other definitions for ester that I've seen before include "Chemical compound of acid and alcohol, found in trees" , "Organic compound, rhymes with court joker" , "Organic chemical compound" , "Fat" , "radical" .)