| Clue | Source | Date |
|---|---|---|
| Generally accepted, but not official, rule (9,3) | The Guardian Quick | 28 Jul 2026 |
| As a rule, is it spoken? (9,3) | ||
| Oral has Bill succeeding with 'Custom and Practice' | The Telegraph Toughie | 05 Nov 2020 |
| Organisation summons more than nine from the bar, as it's the custom and everyone agrees with it | ||
| Custom-based rule | ||
| Custom-based rule |