Related Clues:

• Part of a countdown
• Word before and after 'by,' 'on,' or 'to'
• Bill in a tip jar
• In need of gas?
• Not divided
• Bottom of some scales
• Calorie count of some diet drinks
• Unrealistic potato chip portion
• America's country code
• With 4-Down, some swimsuits
• ''Takes ___ to know ...''
• Free-throw score
• I for Claudius
• A single
• It's the loneliest number