Writer Bagnold (4)
I believe the answer is:
enid
'writer bagnold' 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 "& 18 Down Children's author" , "Geraint's wife's" , "Miss Blyton" , "'... Blyton, children's author (4)'" , "Arthurian wife" .)