Related Clues:

• Grit
• Rock group?
• Rough voice, metaphorically
• Material for some driveways
• Driveway surface
• Road cover
• Driveway material
• Type of driveway
• Driveway cover, perhaps
• Driveway covering
• Little stones
• Rural road surface
• Rocky road ingredient?
• Mass of small stones
• Rock fragments and pebbles