Pixie, sprite (3)
I believe the answer is:
elf
This clue is a double definition.
'pixie' is the first definition.
(synonyms)
'sprite' is the second definition.
(an elf is a sprite)
(Other definitions for elf that I've seen before include "He causes mischief" , "Mischievous fairy No.2" , "Woodland sprite" , "Hobgoblin" , "Mischievous fairies" .)