Related Clues:

• Actor without lines, maybe
• Chaplin, for one
• Shellfish
• Marcel Marceau, e.g.
• One disinclined to talk
• Play charades
• Bisque morsel, perhaps
• Quiet showman
• Act dumb?
• Uncommunicative one
• Quahog
• Digger's find
• Bivalve mollusk
• Silent entertainer
• Save one's speech