Company of wiseacre wearing (4)
I believe the answer is:
crew
'company' is the definition.
(a group of people)
'of wiseacre wearing' is the wordplay.
'of' indicates the answer is hidden within the clue.
'CREW' is hidden within 'wiseacre wearing'.
(Other definitions for crew that I've seen before include "Group of operators" , "A ship's workers" , "They operate ships or aircraft, say" , "Very short haircut for the ship's complement" , "Work gang" .)