Crustaceans often served in a Marie Rose sauce (6)

I believe the answer is:

prawns

(Other definitions for prawns that I've seen before include "Small shrimp-like sea creature" , "Edible shellfish like large shrimps" , "Small shrimp-like sea creatures" , "Tasty shellfish - they're tasty in cocktails" , "Edible shellfish, nice in cocktail" .)

I've seen this clue in The Times.

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