Related Clues:

• Fossil fuel residue
• It may be caught in the flue
• Dirty film?
• It turns Santa's suit black
• Smokestack buildup
• Diesel by-product
• Coat inside a chimney
• Pollution component
• Santa suit stainer
• Sweep's removal
• Carbonaceous grime
• Brother goes to America welcoming Takeaway set-up with European capital
• Challenge for Santa's dry-cleaner
• City over in Europe's less urbanised
• Santa's suit stainer