Related Clues:

• Roof covering, perhaps
• Firmly fix
• Highway sealer
• Establish firmly
• Fossil repository, often
• Pit contents, perhaps
• Pitch for the road crew?
• Surfacing stuff
• 49-Across source
• Feather partner
• Type of driveway
• It may pave the way
• Camel hazard?
• Roofing gunk
• Walk material