Moorland birds grumble (6)

I believe the answer is:

grouse

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

This might be a double definition.

'moorland birds' is the first definition.
'grouse' can be an answer for 'birds'. I am not certain of the 'moorland' bit.

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

Can you help me to learn more?

(Other definitions for grouse that I've seen before include "Plump game bird" , "Complain pettily" , "Petty complaint" , "Bellyache" , "Complain like gamebird" .)

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