Culprit (8)
I believe the answer is:
offender
'culprit' is the definition.
(I know that culprit can be written as offender)
This is the entire clue.
(Other definitions for offender that I've seen before include "Transgressor, lawbreaker" , "causing resentment?" , "miscreant" , "Committer of illegal act" , "Wrongdoer" .)