French writer — some of his art renowned (6)
I believe the answer is:
sartre
'french writer' is the definition.
(I've seen this in another clue)
'some of his art renowned' is the wordplay.
'some of' indicates a hidden word.
'SARTRE' can be found hidden inside 'his art renowned'.
(Other definitions for sartre that I've seen before include "Jean-Paul --, French author and philosopher" , "Jean-Paul -, French philosopher/author" , "Arrest (anag) - French philosopher, d. 1980" , "French existentialist philosopher and writer" , "Jean-Paul --, French writer and philosopher" .)