Possible Clues:

• Academy leader
• Influence for Aristotle
• Wise old Greek squad, running away
• “Allegory of the Cave” originator
• Philosopher taught by Socrates
• Principals prohibit learning about teachings of this idealist
• Philosopher's occupational therapy: mountain climbing
• Philosopher and squad, not working
• 'Knowledge is the food of the soul' speaker
• Speaker of the quote found in this puzzle's circled letters