Related Clues:

• Emulate a mouse
• Beleaguer, with 'at'
• Firmness of character
• Sandy particles
• Use the teeth to erode
• Work on a bone, say
• Chew like a rodent
• Eat (at)
• Wear away by nibbling
• Chew, squirrel-style
• Sand and such
• Emulate a rat
• Be an eager beaver
• Emulate a rodent
• Cause persistent worry