Related Clues:

• Nibble on, as a bone
• Use the teeth to erode
• Work on a bone, say
• Chew like a rodent
• Eat (at)
• Wear away by nibbling
• Chew, squirrel-style
• Emulate a rat
• Be an eager beaver
• Emulate a rodent
• Cause persistent worry
• Work one's incisors
• Act like a rat
• Chew, as a beaver
• Chew on a bone