Is this bird never satisfied? (6)

I believe the answer is:

grouse

I'm a little stuck... Click here to teach me more about this clue!

'is this bird never satisfied?' is the definition.
'grouse' can be an answer for 'bird' (grouse is a kind of bird). I am unsure of the remainder of the definition.

This is all the clue.

Can you help me to learn more?

(Other definitions for grouse that I've seen before include "Plump game bird" , "Game bird - beef" , "Petty complaint" , "1D [GAMEBIRD] < having grumble" , "Grumble; game bird" .)

I've seen this clue in The Irish News.

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