| Clue | Source | Date |
|---|---|---|
| Hard-wearing, but there's a big levy on (5-4) | ||
| Extra sturdy (Hyph.) | ||
| Designed for demanding work (5-4) | ||
| Enduring oppressive tax (5-4) | ||
| Super-sturdy | Eugene Sheffer | 04 Apr 2022 |
| *Industrial-strength | New York Times | 03 Nov 2020 |
| Substantial job as hired muscle? | The Telegraph Toughie | 31 Mar 2017 |
| *Very durable | ||
| Extra sturdy | ||
| Industrial strength |