Last seen in:
Related Clues:
- Flue problem
- Dole covers race leading to residue from Big Smoke
- Diesel discharge
- Platform ... or something that appears four times in this puzzle?
- Pipe buildup
- Coke product?
- Smudge on 49-Across's suit
- Dirty coat?
- Portion that keeps dry - it's left in pipe
- Residue from burning
- Carbon from burning
- Deposited carbon
- Form of carbon
- Black powder
- Plug (especially of tobacco left in pipe)