As a novelist, she had to call back (7)
I believe the answer is:
shelley
'as a novelist' is the definition.
I can't judge whether this defines the answer.
'she had to call back' is the wordplay.
'had' is a charade indicator (letters next to each other).
'to call' becomes 'yell' (synonyms).
'back' is a reversal indicator.
'yell' back-to-front is 'lley'.
'she'+'lley'='SHELLEY'
Can you help me to learn more?
(Other definitions for shelley that I've seen before include "Ode to the West Wind poet" , "English Romantic poet" , "Author of Frankenstein" , "Percy Bysshe . . . . . . ., great English poet" , "Mary - - (Gothick writer)" .)