Related Clues:

• I for Claudius
• A single
• It's the loneliest number
• With 51-Across, a fair hand
• Two halves
• Date minimum
• Finish on top
• Letterless phone number
• Till bill, perhaps
• Tommy Lasorda's retired Dodgers number
• I might stand for it
• Greenback
• Part of a New Year's Eve countdown
• Partner of all
• "A Chorus Line" song