Related Clues:

• Shrimp, for one
• Shelley may have sounded crabbed, but not like this
• Tin containing curate's chopped-up seafood
• A scarce nut is unusual life form with hard case
• Perhaps crab tin contains sign of decay: something one can't return
• Eg, lobster
• Such as a barnacle
• Woodlouse, say, can react badly if interrupted by us
• Such as a crab or shrimp
• Piece of bread one served with an aquatic delicacy
• eg Crab
• Expert article on some bread and crab, for example
• Tuna scarce? Perhaps - and lobster, for example
• E.g. crab, lobster, woodlouse
• Hard-shelled animal