"The Immoralist" author (4)
I believe the answer is:
gide
'the immoralist author' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gide that I've seen before include "Andre -, C Nineteen-twenty French author" , "Andre -, French novelist" , "Andre --, French writer" , "Andre -, Fr. novelist" .)