Related Clues:

• Sea snail
• Nacre maker
• Conch cousin
• Would you be able on a US shellfish?
• Marine mollusc
• Edible mollusc
• All by himself the seaman got the shellfish
• The solitary seaman might retire into his shell
• A seaman, all by himself, may retire into his shell
• Might the seaman by himself be the equal of Shelley, perhaps, by the sound of it?
• The sort of seafood that the seaman got all by himself
• Might the graduate turn up and come out of his shell all by himself?
• AB retired into his shell for solitary
• A graduate by himself does not come out of his shell
• Source of iridescent buttons