Related Clues:

• Hardwood
• Hot issue?
• Coal-mining waste
• Refuse
• Rowan, e.g.
• It once settled near Pompeii
• Volcano detritus
• Hearth residue
• Grateful?
• Flue residue
• Cigarette waste
• Shade tree
• Durable wood
• Grate expectations?
• Soda ___