| Clue | Source | Date |
|---|---|---|
| Secretly enter into rental if it can be arranged | ||
| Join a group, as for spying | Newsday | 29 Mar 2023 |
| Enter latrine and fit switch | ||
| Enter surreptitiously, as an organization | New York Times | 04 May 2016 |
| With revision, Fine Art & Lit gradually sink in | The Telegraph Toughie | 17 Apr 2015 |
| Marching one abreast, crossing middle of hostile desert, enter secretly | The Telegraph Toughie | 02 Jan 2015 |
| Do secret-agent work |