Fairy or elf (5)
I believe the answer is:
pixie
This clue is a double definition.
'fairy' is the first definition.
(I know that pixie is a type of fairy)
'elf' is the second definition.
(I know that elf can be written as pixie)
(Other definitions for pixie that I've seen before include "Small supernatural being in fairy tales" , "Mischievous fairy" , "Elf, imp" , "Little person" , "Elfin fairy" .)