Related Clues:

• Thing to be as happy as
• Chowder chunk
• Nontalkative one
• Silent type
• Happy mollusk?
• Cherrystone, e.g.
• Mollusk with an irregular shell
• Chowder flavor
• Simoleon
• Riverboat
• Reticent one
• One who's close-mouthed
• Soup or sandwich ingredient
• Marine mollusk
• Untalkative one