Related Clues:

• Like some steak bones
• Wore down
• Chewed on a bone
• Chewed on
• Made like a rodent
• Chewed with canine teeth, perhaps
• Chewed
• Chewed like a rodent
• Ate like a 109 Across
• Worried persistently
• Ate like a mouse
• Nibbled persistently
• Plagued
• Bit persistently at something hard
• Chewed at like dog with bone