Related Clues:

• What rodents do
• Cause corrosion
• Tenacity
• Abrasive stuff
• Moral fiber
• Work on, as a bone
• Perseverance
• Abrasive particles
• Agitate, with "at"
• Imitate a beaver
• Chew away at
• Act the rodent
• ''True ___'' (John Wayne movie)
• Sandpaper grade
• Eat like a rat