| Clue | Source | Date |
|---|---|---|
| Formed into a residue of coal | ||
| Converted into fuel, as coal | New York Times | 11 Nov 2020 |
| Heated coal for fuel use | Universal | 15 Dec 2018 |
| Heated coal for fuel use | ||
| Converted from coal via distillation | Universal | 26 Feb 2015 |
| Converted from coal via distillation | ||
| Strung (out) | ||
| Out of one's mind, in a way, with "up" | ||
| Drugged out, with "up" | ||
| Converted from coal via distillation | ||
| Drugged out, with "up" | ||
| High, in a way, with "up" | ||
| Obtained coal residue. |