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