Related Clues:

• Casual day no-no
• Casual day no-no
• Alternative to a nail
• Bind up
• Hog follower
• Even finish
• Make even
• Boat propeller
• 20-20, say
• Drywall fastener
• Haberdashery buy
• 50-50, say
• What 21-Across 51-Down is
• Have no loose ends?
• Get even?