Possible Clues:

• Jean-Paul --, French philosopher and novelist
• Philosopher some philosopher trashed on reflection
• "No Exit" playwright Jean-Paul
• French philosopher’s arrest arranged
• 'Being and Nothingness' philosopher
• Wrongly arrest existentialist
• Existentialist element of religious art rejected
• Paris-born philosopher
• French writer who refused the 1964 Nobel Prize in Literature
• "Man is condemned to be free" philosopher