Crustaceans (9)

I think it could be either:

Which length description are you looking for?:

shellfish

'crustaceans' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for shellfish that I've seen before include "provider of pearls?" , "Lobsters, cockles, mussels etc" , "A shrimp, maybe" , "Category of seafood" , "Oysters, crabs, shrimps etc" .)

I've seen this clue in The Telegraph.

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