The fairytale girl left after the fire (7)
I believe the answer is:
cinders
'left after the fire' is the definition.
I can't tell whether this defines the answer.
'the fairytale girl' is the wordplay.
I cannot really see how this works, but
'girl' could be 'de' and 'de' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cinders that I've seen before include "Pieces of partly burned coal" , "Embers" , "girl kept at home" .)