| Clue | Source | Date |
|---|---|---|
| Of a sound wave, having a large number of cycles per second (4,9) | Puzzler | 23 Jul 2026 |
| Regular recurrence on radio (4,9) | ||
| Like a sound dogs can hear but humans can't | USA Today | 13 Apr 2021 |
| Husband querying chef recklessly cycling a lot | The Telegraph Toughie | 30 Oct 2019 |