Sprite, gremlin (3)
I believe the answer is:
imp
I believe this clue is a double definition.
'sprite' is the first definition.
(I know that imp is a type of sprite)
'gremlin' is the second definition.
(both can mean a mischievous creature)
(Other definitions for imp that I've seen before include "Scallywag" , "Sprite; add feathers to" , "A mischievous little devil" , "Young troublemaker" , "one likely to cause trouble" .)