Act sulky (4)

I believe the answer is:

mope

(Other definitions for mope that I've seen before include "Move listlessly and aimlessly" , "Be apathetic or gloomy about poem" , "Move around slowly and aimlessly" , "Hang around being miserable" , "Languish" .)

I've seen this clue in the Newsday and the King Feature Syndicate.

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