Possible Clues:

• Totaliser for the great Greek philosopher of old
• Peripatetic teacher finds realist to convert
• Grow up, bearing child at length to philosopher
• Happen to swallow slug left for philosopher
• Alexander the Great's teacher
• 'History of Animals' author
• Philosopher is alert to changes
• Thinker's article sums up in anger
• Add pounds in wage increase overseen by a polymath
• Philosopher in mad set-to with liar