Related Clues:

• Paper with a promise
• "Will pay later" note
• Slip from a poor bettor
• Slip about money
• "I lost. I'll pay you later" letters
• Financial pledge
• Note in lieu of banknotes
• Card player's marker
• Letters that acknowledge debt
• Reminder with three vowels
• 'Next one's on me!' letters
• Acknowledgment of a debt
• Payback note?
• Initial financial commitment?
• Debt letters, in poker