French philosopher and author of Being and Nothingness (6)

I believe the answer is:

sartre

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

I've seen this clue in The Times.

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