Possible Clues:

• Teacher is cutting edge — pleasure is the aim here!
• Gratification of 'The Don' is murder
• His demon (anag.)
• The pursuit of happiness as a matter of principle
• It's a pleasure to put this philosophy into practice
• The belief that pleasure is the chief good in life
• The pusuit of pleasure as life's greatest good
• Belief that pleasure is the highest good
• Taking pleasure in pleasure
• What's embraced by the don is mindless pursuit of pleasure