Related Clues:
- Informal vouchers
- Debt acknowledgements
- Chits in the pot
- Chits acknowledging debt
- 'They show people are indebted to UUUUUUUUUU, it seems (4)'
- 'They give promise of being UUUUUUUUUU, perhaps (4)'
- Markers of a sort
- Chits in a pot
- Red markers?
- Bill's children
- Shelter for ships
- Letters to creditors?
- Papers promising payment
- They indicate shyness
- Alternatives to chips, say