Related Clues:

• Mollusk with an irregular shell
• Chowder flavor
• Simoleon
• Reticent one
• One who's close-mouthed
• Soup or sandwich ingredient
• Marine mollusk
• Untalkative one
• Secretive sort
• Food in a shell
• Quahog, e.g.
• Silent sort
• Chowder type
• Raw bar item
• Paradigm of happiness