Related Clues:

• Sequence
• Casual day no-no
• Casual day no-no
• Bind up
• Hog follower
• Even finish
• Make even
• Type of letter
• Burger King or The Gap
• K-Mart, for one
• 20-20, say
• Haberdashery buy
• 50-50, say
• What 21-Across 51-Down is
• Have no loose ends?