Possible Clues:

• Bit of surf in surf and turf
• Surveys returned about calcium in seafood
• See battle trophy being put outside, a sort of shell
• Concession about name for shellfish
• Bivalve
• Order placed in fishmonger's perhaps with husband out for seafood
• Bribe covering demand for seafood
• Cooked sliced potato ring in dip
• Edible bivalve mollusc
• Seafood concession cut by demand