Brownies
I believe the answer is:
elves
'brownies' is the definition.
('elf' can be a synonym of 'brownie')
This is all the clue.
(Other definitions for elves that I've seen before include "Imps, pixies" , "Little mischievous fairies" , "Mythical beings" , "Supernatural beings" , "mischievous kids?" .)