| Clue | Source | Date |
|---|---|---|
| Molten iron produced in these industrial structures (5,8) | The Guardian Quick | 06 May 2026 |
| Does this heat make metalworkers swear so? (5,8) | ||
| Does this heat make metal-workers swear so? (5,8) | ||
| Smelters (5,8) | ||
| Ovens for smelting iron | The Guardian Quick | 04 Nov 2021 |
| Iron smelters | The Times Concise | 15 Mar 2018 |
| Pig-iron producers |