Felt bitter or indignant about (8)
I believe the answer is:
resented
'felt bitter or indignant about' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for resented that I've seen before include "Took exception" , "Considered as an insult" , "Felt bitterness at (something)" , "Took umbrage" , "taken ill" .)