Play about at Prom, perhaps (4)
I believe the answer is:
romp
'play about' is the definition.
(I've seen this in another clue)
'prom perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'prom' is an anagram of 'ROMP'.
'at' acts as a link.
(Other definitions for romp that I've seen before include "High jinks" , "Play roughly/energetically; easy victory" , "Play boisterously" , "Rough play; easy victory" , "Boisterous prank" .)