Related Clues:

• Stop talking, with 'up'
• Symbol of uncommunicativeness
• Stolid sort
• Chowder shellfish
• Untalkative sort
• Bit of dough
• Be silent, with "up"
• Smackeroo
• No blabbermouth
• Edible shellfish
• Dollar, casually
• Seafood in a shell
• Marine bivalve
• Uncommunicative sort
• Bivalve