Possible Clues:

• Philosopher is a right TS Eliot, unfortunately
• Thinking Greek has come up to ring Child Line
• Set tailor-made for philosopher
• Well-known Greek's child left in a lift
• An Onassis
• Philosopher is later to change his name
• French nobleman let out philosopher
• Greek philosopher (Poetics, Politics)
• 'Politics' writer in eight volumes
• Totaliser for the great Greek philosopher of old