French existential philosopher and Simone de Beauvoir's partner, d. 1980 (6)

I believe the answer is:

sartre

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

I've seen this clue in The Guardian.

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