| Clue | Source | Date |
|---|---|---|
| Something said to be difficult to crack (4,3) | ||
| Macadamia or Brazil; an aggressive person | The Times Specialist Sunday | 25 May 2025 |
| Brazil, say, presents a problem difficult to crack | ||
| Transforms Ruth and becomes something difficult to crack (4,3) | ||
| Toughie hot and cold savannah to the north from the east | The Telegraph Toughie | 05 Jan 2018 |
| One tough, difficult group of teachers | The Telegraph Cryptic | 14 Nov 2017 |
| Tough person, to a Brit |