| Clue | Source | Date |
|---|---|---|
| Communicating by wireless | New York Times | 23 Nov 2020 |
| Calling for backup, e.g | Wall Street Journal | 19 Dec 2018 |
| Calling for backup, e.g. | ||
| Artist performing without one is communicating via waves | The Times Cryptic | 22 Jun 2017 |
| Ham hobby | Newsday | 22 Oct 2016 |
| Sending short ‘goodbye' during call | ||
| Sending an S O S, maybe | ||
| C.B. activity | ||
| Modern method of communication. |