Change found in contractual terms (5)
I believe the answer is:
alter
'change' is the definition.
(I know that change can be written as alter)
'in contractual terms' is the wordplay.
'in' indicates a hidden word.
'ALTER' is hidden within 'contractual terms'.
'found' acts as a link.
(Other definitions for alter that I've seen before include "Change or adjust" , "Metamorphose" , "Become different" , "Change, modify" , "Adapt" .)