Crossword Genius

A bird that has to grumble (6)

Ross

I believe the answer is:

grouse

I believe this is a double definition.

'a bird' is the first definition.
(grouse is a kind of bird)

'to grumble' is the second definition.
(I've seen this before)

'that has' acts as a link.

(Other definitions for grouse that I've seen before include "Complain pettily" , "1D [GAMEBIRD] < having grumble" , "Gripe; game bird" , "Grumble like game-bird" , "Complain like gamebird" .)

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