Good to stir up complaint (6)
I believe the answer is:
grouse
'complaint' is the definition.
(I've seen this before)
'good to stir up' is the wordplay.
'good' becomes 'g' (abbreviation).
'to stir up' becomes 'rouse' (I've seen this before).
'g'+'rouse'='GROUSE'
(Other definitions for grouse that I've seen before include "Grumble; game bird" , "Plump game bird" , "No shooting it before 12 August" , "Grumble like game-bird" , "Game bird - beef" .)