Chronic critic (3)
I believe the answer is:
nag
'chronic critic' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nag that I've seen before include "Jade" , "Henpeck, scold non-stop" , "Find fault" , "Badger continually like old horse" , "Complain, worry" .)