Crossword Genius

Complain to a flyer (6)

Ross

I believe the answer is:

grouse

This clue is a double definition.

'complain' is the first definition.
(I know that grouse is a more specific form of the action complain)

'to a flyer' is the second definition.
(something which flies)

(Other definitions for grouse that I've seen before include "Complain pettily" , "Plump game bird" , "Petty complaint" , "excellent in New Zealand" , "See game bird" .)

I've seen this clue in The Mirror.
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