Related Clues:

• Gambler's chit
• Letters of payback
• Debt paper
• Slip-in with the antes
• Note of debt
• Acknowledgment of debt
• Bettor's slip
• Gambler's memo
• Poker player's last resort
• Note to be used later
• Repayment reminder
• Debt acknowledgment
• Letters written by someone who's a bit shy?
• Poker pot item, perhaps
• Payment proxy