Writer Blyton (4)
I believe the answer is:
enid
'writer blyton' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for enid that I've seen before include "Miss Blyton" , "Dine out on this girl's name also" , "- Blyton, children's writer" , "W - - Blyton" , "Dine with this girl" .)