Related Clues:

• With 17-across, cause of mass ruin
• Woods unit
• 55-Across, e.g.
• Tic toe --
• "___ Life to Live"
• Shoe insert
• Common bill
• Forest unit
• Charlie Brown's kite-eater
• Low bill
• Person
• Early hour
• Binary digit
• With 30-Down, combination punch
• Arboretum sight