Related Clues:

• End of a countdown
• "We're number ___!"
• Insepar-able
• With 17-across, cause of mass ruin
• "___ Life to Live"
• Common bill
• Low bill
• Person
• Early hour
• Binary digit
• With 30-Down, combination punch
• Self starter
• Die face
• "Take ___"
• Like lowest-mileage driving