Resentful canine perhaps time will break (6)
I believe the answer is:
bitter
'resentful' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for bitter that I've seen before include "Tart like some English beer" , "Act nervously" , "Acrimonious; beer" , "Kind of British beer" , "Sour kind of English ale?" .)