She's a Darling (5)
I believe the answer is:
wendy
This might be a double definition.
'she's' is the first definition.
'a darling' is the second definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?
Can you help me to learn more?
(Other definitions for wendy that I've seen before include "Girl associated with 13" , "31's friend" , "Peter Pan's friend" , "Peter's girl-friend" , "Art-loving Sister (TV)" .)