Complain of confused small rogue (6)
I believe the answer is:
grouse
'complain' is the definition.
(I know that complain is the is a more specific form of the action of grouse.)
'confused small rogue' is the wordplay.
'confused' is an anagram indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
's'+'rogue'='srogue'
'srogue' is an anagram of 'GROUSE'.
'of' acts as a link.
(Other definitions for grouse that I've seen before include "Grumble like game-bird" , "Gripe; game bird" , "1D [GAMEBIRD] < having grumble" , "Complain like game bird" , "excellent in New Zealand" .)