Related Clues:

• Roof covering, perhaps
• Highway sealer
• Essential nutrient
• Coleridge character
• Pungent wit
• Fossil repository, often
• Pit contents, perhaps
• Pitch for the road crew?
• Surfacing stuff
• 49-Across source
• Feather partner
• It may be shaken out
• Common condiment
• It's often passed
• It may pave the way