In a bad mood; irritable (6)

I believe the answer is:

crabby

(Other definitions for crabby that I've seen before include "Cantankerous like crustacean" , "Ill-tempered" , "Sour-tempered like common crustacean" , "Bad-tempered, grouchy" , "Temperamental" .)

I've seen this clue in the Sydney Morning Herald.

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