Acts spoiled (6)
I believe the answer is:
whines
'acts spoiled' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for whines that I've seen before include "Makes high complaining sound like dog" , "Complains or snivels in newish way" , "bellyaches" , "Complains in petty or feeble way" , "Complains in petty way - like dog?" .)