Related Clues:

• Mary Kay's last name
• A certain tray may hold it
• Bit of air pollution
• It comes from your butt?
• Hard lumber
• Burning remnant
• Tree before or after a fire
• Burnt log leftover
• Ember, in the end
• Powdery residue
• Mt. St. Helens spew
• Guitar wood
• Combustion product
• A drop-off among smokers?
• Soot