| Clue | Source | Date |
|---|---|---|
| Compulsory Latin (4,3,3) | ||
| Must-have | The Times Concise | 28 Jan 2024 |
| Must European queen soon offend, put in the lead? (4,3,3) | ||
| Must European queen soon offend, put in the lead? | The Guardian Cryptic | 16 Jan 2024 |
| Strict prerequisite | LA Times Daily | 22 Apr 2020 |
| Strict prerequisite | The Washington Post | 22 Apr 2020 |
| Must-have | Newsday | 17 Mar 2018 |
| Essential element | New York Times | 27 Aug 2016 |
| Essential element | ||
| Essential | ||
| Essential | ||
| Requirement | ||
| *Without which not | ||
| Essential part | ||
| Essential | ||
| Prerequisite | ||
| Indispensable condition | ||
| Absolute necessity | ||
| Essential | ||
| Essential. |