Related Clues:

• A single
• It's the loneliest number
• Two halves
• Finish on top
• Letterless phone number
• Till bill, perhaps
• I might stand for it
• Greenback
• Part of a New Year's Eve countdown
• Partner of all
• "A Chorus Line" song
• Ozzie Smith's retired number
• Barely any
• Clue that started this all
• Math unity