Related Clues:

• Gambler's initialism
• Payment voucher
• Letters from a person who's shy?
• Signed promise to pay
• Bettor's note
• Payment promise
• "Pay you next time!"
• Short person's offering?
• Slip signed by a debtor
• Note left after stealing a roommate's food, say
• Note traded for bills
• Debt letters
• Note from one who's shy
• Slip among chips?
• Controversial letters in California, these days