| Clue | Source | Date |
|---|---|---|
| Bugging (phone) | ||
| Audio surveillance technique (TIE WRAPPING anagram) (11) | ||
| Surveillance method | The Times Concise | 24 Jul 2022 |
| Something that bugs criminals? | New York Times | 15 Aug 2021 |
| Republican mangled tape during erasing of secret recording | The Telegraph Toughie | 24 May 2017 |
| Audio surveillance method | ||
| Surveillance technique | ||
| Surveillance technique | ||
| Controversial means of evidence. |