Frolic boisterously (4)
I believe the answer is:
romp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">frolic boisterously</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for romp that I've seen before include "Make merry at prom" , "Rough play; easy victory" , "Play boisterously" , "sexy fun" , "Boisterous prank" .)