Related Clues:

• Make like a beaver
• Chew persistently
• Nibble at
• Eat like a mouse
• Chew like a rat
• Chew away
• Eat indelicately
• Imitate a rodent
• Emulate a mouse or beaver
• Wear away, in a way
• Eat away (at)
• What rodents do
• Cause corrosion
• Chew, as a 62-Across
• Work on, as a bone