Fairy-tale porridge eater (10)
I believe the answer is:
goldilocks
'fairy-tale porridge eater' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for goldilocks that I've seen before include "Childish housebreaker" , "Trespasser" , "fairly shocked girl" , "Plant" , "Fairy tale porridge thief" .)