French writer of the 1939 book of short stories Le Mur (6)

I believe the answer is:

sartre

(Other definitions for sartre that I've seen before include "French philosopher, 1905-80" , "French existentialist philosopher and writer" , "Jean-Paul ___, French existentialist, d. 1980" , "Jean-Paul --, French writer and philosopher" , "Arrest (anag) - French philosopher, d. 1980" .)

I've seen this clue in The Sun.

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