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French philosopher (9)

Ross

I think it could be either:

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6

9

descartes

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

This is the entire clue.

(Other definitions for descartes that I've seen before include "Cogito ergo sum philosopher" , "French philosopher, d. 1650" , "One who thought" , "Cogito, ergo sum man" , "Rene --, philosopher" .)

I've seen this clue in the Newsday.com, The Telegraph, the Thinks.com and The Times.
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