Complaint that rouge's messy (6)
I believe the answer is:
grouse
'complaint' is the definition.
(I've seen this before)
'rouge's messy' is the wordplay.
'messy' indicates anagramming the letters.
'rouges' is an anagram of 'GROUSE'.
'that' is the link.
(Other definitions for grouse that I've seen before include "Plump game bird" , "Petty complaint" , "Grumble like game-bird" , "Bird - complaint" , "1D [GAMEBIRD] < having grumble" .)