Fairy cake! (7)
I believe the answer is:
brownie
I believe this is a double definition.
'fairy' is the first definition.
(I know that brownie is a type of fairy)
'cake' is the second definition.
(brownie is a kind of cake)
(Other definitions for brownie that I've seen before include "Young Girl Guide..." , "Junior Girl Guide" , "sweet thing" , "Disciplined youngster" , "Benevolent elf; cake" .)