Little tricksters (4)
I believe the answer is:
imps
'little tricksters' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for imps that I've seen before include "Mischievous spirits" , "Demons" , "Cheeky little devils" , "Small devils or mischievous children" , "Troublemakers" .)