Philosopher certain to abandon university and embrace art (6)

I believe the answer is:

sartre

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'philosopher' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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

I've seen this clue in The Irish Times.

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