French writer rejected fancy English (4)
I believe the answer is:
gide
'french writer' is the definition.
(Andre Gide)
'rejected fancy english' is the wordplay.
'rejected' says the letters should be written backwards.
'fancy' becomes 'dig'.
'english' becomes 'e' (abbreviation).
'dig' written backwards gives 'gid'.
'gid'+'e'='GIDE'
(Other definitions for gide that I've seen before include "Andre -, Fr. novelist" , "Andre --, French writer" , "Andre -, French novelist" , "Andre -, C Nineteen-twenty French author" .)