Away to finish revolt (6)
I believe the answer is:
offend
'revolt' is the definition.
(I know that offend is a kind of revolt)
'away to finish' is the wordplay.
'away' becomes 'off' (synonyms).
'to finish' becomes 'end' ('end' can be a synonym of 'finish').
'off'+'end'='OFFEND'
(Other definitions for offend that I've seen before include "Be displeasing to" , "Act in disregard of the law" , "Distress" , "Cause to feel hurt" , "Aggrieve" .)