Related Clues:

• See 30-Across
• Proof of purchase
• It may change with a promotion
• Part of a spine, usually
• Identification
• See 13-Across
• Fighter's goal
• Royal address
• Boxer's dream
• 58 Across, for example
• Evidence of ownership
• ''Wheel of Fortune'' category
• Sir or madam
• ''The Odd Couple,'' e.g.
• Best-seller list entry