Shellfish sold by Dublin's Molly Malone (6)

I believe the answer is:

mussel

(Other definitions for mussel that I've seen before include "Edible marine mollusc sold by Molly Malone - not the cockle" , "Common edible marine mollusc" , "Type of shellfish" , "The shellfish sounds strong" , "Seafood item" .)

I've seen this clue in The Guardian.

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