Possible Clues:

• The second keyboard instrument — nothing less will do for performer
• Stage actor
• Lead in tragedy developed in phase -- by such?
• Articles about singular sanctimonious luvvie
• Luvvie's fine turns in the country
• One who acts in haste, perhaps, crossing head of police
• He paints badly but he can act
• A real drama queen
• Many an Actors Studio member
• Actor chap's really good, appearing in hit repeatedly