Related Clues:

• Yak it up
• Chops
• Talk at length
• Chatter away
• Leno's prominence
• Mouth mover
• Jabber vociferously
• Paleontologist's discovery
• Uppercut target
• Talk on and on
• Face part
• It's big on Leno
• Moose feature
• Maxilla or mandible
• Haymaker target