Seafood, usually steamed in wine (6)
I believe the answer is:
mussel
(Other definitions for mussel that I've seen before include "Edible shellfish" , "Type of shellfish" , "Pearl may come from it" , "Edible marine mollusc sold by Molly Malone - not the cockle" , "Edible bivalve mollusc, sticks to rocks" .)