Philosopher Descartes (4)

I believe the answer is:

rene

'philosopher descartes' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for rene that I've seen before include "- Descartes, French mathematician" , "-- Magritte, artist" , "- Lalique, glass artist" .)

I've seen this clue in The Sun, the USA Today, The New York Times, the LA Times, the Universal and the Newsday.

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