Grumpy about revolting year (6)
I believe the answer is:
cranky
'grumpy' is the definition.
(I've seen this in another clue)
'about revolting year' is the wordplay.
I cannot really see how this works, but
'about' could be 'c' (abbreviation for circa) and 'c' is found in the answer.
'year' could be 'y' and 'y' is found in the answer.
The remaining letters 'rank' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cranky that I've seen before include "Crabby" , "'Fractious, irritable (6)'" , "Crotchety" , "Eccentric, strange" , "Eccentric - bad-tempered" .)