Related Clues:

• 'Next round's on me'
• Informal repayment promise
• Note promising notes
• Bettor's letters
• Tapped-out person's letters
• Debt, in short
• Gambling debt, so to speak
• Debt acknowledgements
• Payment promise letters
• Pot marker
• Promising note?
• Chits in the pot
• Chit acknowledging debt
• Chits acknowledging debt
• Note acknowledging debt