Related Clues:

• Unit of punishment
• 20-20, say
• Word with back or eye
• Haberdashery buy
• 50-50, say
• What 21-Across 51-Down is
• Have no loose ends?
• Get even?
• Word with whip or tongue
• Eye piece
• Share first, e.g.
• Target for mascara
• Respond angrily, with 'out'
• June gift, perhaps
• No-win situation?