A short work of fiction: November Girl (7)
I believe the answer is:
novella
'a short work of fiction' is the definition.
(I've seen this before)
'november girl' is the wordplay.
'november' becomes 'nov' (short for November).
'girl' becomes 'ella' (girl's name).
'nov'+'ella'='NOVELLA'
(Other definitions for novella that I've seen before include "Short fictional piece" , "Nothing like War and Peace" , "Composition" , "Slim work of fiction" , "story, short one" .)