Related Clues:

• Bite on something persistently
• Eat away at metal bar in centre
• Eat like a rodent and not audibly
• Plague, with 'at'
• Badly bother, with 'at'
• Champ, furthermore, not heard by many?
• What rats may do to baseboards
• Bite like a rodent
• Make like a mouse
• Work on an ear?
• Make a mouse hole, say
• Chew, beaver-style
• Emulate beavers
• Squirrels do it
• Emulate rodents