Related Clues:

• Forest fire obscurer
• Volcanic discharge
• Grey shade
• Black layer found in Morbier cheese
• Cloud from some volcanos
• Fire powder
• Blue Jays' head honcho Gord
• Gray spray
• Fireplace bit
• Camp residue
• Grate fill
• Cheroot residue
• Remains to be seen?
• Camp leftovers
• Result of an eruption, perhaps