Complainer (5)

I believe the answer is:

grump

'complainer' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for grump that I've seen before include "Surly person" , "surly type" , "pet?" , "Sulky type" , "Sulky person" .)

I've seen this clue in The Sunday Times and The Times.

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