Francoise —, author of 1954 novel Bonjour Tristesse (5)

I believe the answer is:

sagan

(Other definitions for sagan that I've seen before include "French author" , "Astronomer" , "Author of Bonjour Tristesse, d. 2004" , "US scientist" , "French authoress" .)

I've seen this clue in The Mirror.

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