| Clue | Source | Date |
|---|---|---|
| Board up when aquatic mammal away (4,3) | ||
| Block or board up (4,3) | ||
| Board up (4,3) | Puzzler | 13 Feb 2024 |
| Secure, in a way | LA Times Daily | 02 Jul 2022 |
| Swimmer no longer available to get cap | The Telegraph Toughie | 01 Oct 2020 |
| Keep anyone from entering | Newsday | 23 Feb 2020 |
| Completely isolate (an area) | The Times Concise | 02 Aug 2017 |
| Make tight | ||
| Quarantine | ||
| Blockade | ||
| Blockade | ||
| Close securely | ||
| Barricade | ||
| Prevent exit or entry. | ||
| Close away from. |