Related Clues:

• Boldness
• Abrasive granules
• "True ---" (John Wayne film)
• Bite away at
• Chew on
• Be beaverish
• Trouble persistently
• Toughness
• Chew like a mouse
• Be an eager beaver?
• John Wayne's "True ___"
• Clench
• Rodents do it
• Make like a beaver
• Sand