| Clue | Source | Date |
|---|---|---|
| A lot of sheepdogs flit about showing maximum pace? (5,2,5) | The Guardian Quiptic | 23 Feb 2025 |
| Instrument's air journey extremely fast at this rate (5,2,5) | ||
| The c in Einstein's equation | The Times Concise | 28 Apr 2015 |
| Impatient leprechaun's concern on an airplane? | ||
| 299,792,458 meters/second | ||
| C, sometimes | ||
| See 17 Across | ||
| C |