| Clue | Source | Date |
|---|---|---|
| Take time, test one, say for measure of speed (4,6) | ||
| There's a boom when it goes over one | The Telegraph Cryptic | 10 Sep 2020 |
| Ratio of airspeed to velocity of sound | The Telegraph General Knowledge | 24 Feb 2019 |
| It indicates how many times you'll be made fun of after doing something dumb? | ||
| Measure of speed, in the jet age. |