Related Clues:

• Gambler's marker
• Unofficial promissory note
• Debt voucher
• Letters from a debtor
• Slip in a pot
• Payment substitute
• Debtor's paper
• Letters a collector receives?
• Creditor's holding
• Promissory note
• Payment pledge
• Debt reminder
• Note in a pot, perhaps
• Gambler's last resort
• Initial promise?