Related Clues:

• Barbecue by-product
• Campout fallout
• Holy Wednesday forehead marker
• It buried Herculaneum
• Butt remains
• Common tree
• Dusty remnant
• Eyjafjallajökull output
• Fireplace debris
• Word with "blond" or "Wednesday"
• Wood used to make guitars
• The gray in a tray
• Bonfire remains
• Reminder of an old flame?
• The mythical tree Yggdrasil, for one