Jape (5)
I believe the answer is:
prank
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jape</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that jape can be written as prank)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for prank that I've seen before include "High-spirited mischief" , "Escapade" , "Jape" , "April fool" , "Mischievous act done for fun and amusement" .)