Related Clues:

• Emulate a marmot
• Nibble ceaselessly
• Liberal, so to speak
• Chew on wood
• Dogged determination
• "True __": John Wayne film
• One thing rodents do
• Munch on like a mouse
• Not just nibble
• Nibble away (on)
• Wayne's was "True"
• Chew like a chipmunk
• Chew like a rabbit
• Abrasive bits
• Eat, beaver-style