Related Clues:

• Result of an eruption, perhaps
• Chimney sweep's grime
• Cigar remnant
• Barbecue remnant
• Campfire leftover
• _____Wednesday
• Briquettes, after burning
• Deciduous tree
• Volcano's legacy
• 16-Across residue
• Stain on Santa's coat, you'd think
• Fireplace stuff
• Remains on the hearth
• Hearth refuse
• Barbecue leftovers