Related Clues:

• Downing Street number
• See 50-Down
• Royal flush card
• Gymnastic perfection
• Bo Derek's rating
• Time for 'Taps'
• See 89-Down
• Count on both hands
• Evening hour
• Decimal base
• Perfect rating in gymnastics
• Caesar's X
• See 61-Across
• Perfect beauty, maybe
• Comaneci accomplishment