Habitually sullen person (8)

I believe the answer is:

sourpuss

'habitually sullen person' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sourpuss that I've seen before include "Habitually sullen person" , "Bad-tempered person" , "One has a habitually sullen expression" , "Grumbler" , "Miserable so-and-so" .)

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

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