Related Clues:

• Bite steadily on
• He is in the middle of the rust
• Constantly chew at
• Nibble (on)
• Chew, as rodents do
• Chew like mice do
• Make like a rodent
• Chew away (at)
• Make mouseholes, maybe
• Eat like a chinchilla
• Agitate (with "at")
• Chew like chipmunks
• Use one's incisors
• Act like a rat, say
• Attack a chew toy