Fairies (6)
I believe the answer is:
pixies
'fairies' is the definition.
(I know this)
This is all the clue.
(Other definitions for pixies that I've seen before include "small fairies in children's tales" , "Mischievous fairies" , "Little (mischievous) people" , "Elves, imps" , "Small supernatural beings in fairy tales" .)