| Clue | Source | Date |
|---|---|---|
| More full of chimney dirt | ||
| More like a dirty fireplace | USA Today | 27 Jan 2022 |
| Note books on hire are regularly getting dirtier | The Telegraph Cryptic | 14 Nov 2019 |
| Dirtier, as a chimney | Premier Sunday | 10 Sep 2017 |
| More carbon-covered | ||
| More dirty, as Santa's boots | ||
| Having swept more chimneys? | ||
| Blacker | ||
| Blacker | ||
| Like a busier sweep | ||
| Like Santa after returning to the North Pole? | ||
| Like a busier sweep? | ||
| More blackened | ||
| More fuliginous | ||
| More blackened. |