Author Bagnold (4)
I believe the answer is:
enid
'author 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 "'... Blyton, children's author (4)'" , "Dine with this girl" , "Geraint's loved one" , "W - - Blyton" , "& 18 Down Children's author" .)