Related Clues:

• Psych subject
• It sometimes needs a massage
• Lack of modesty
• Star quality, perhaps
• Chutzpah source
• Id partner
• Freud's study
• Narcissus, for one
• A diva has a big one
• Id modifier
• I, as in personality
• Praise might make it swell
• Maniacal leader?
• Philosopher's self
• One seeking gratification