French writer and philosopher (6)

I believe the answer is:

sartre

(Other definitions for sartre that I've seen before include "French existentialist philosopher and writer" , "Jean-Paul -, French philosopher/author" , "Jean Paul . . ., French existentialist writer" , "Jean Paul -, French author" , "Jean-Paul --, French author and philosopher" .)

I've seen this clue in The Times.

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