Shout reportedly awakens shellfish (7)

I believe the answer is:

oysters

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'shellfish' is the definition.
(I know this)

I don't understand how the rest of the clue works.

(Other definitions for oysters that I've seen before include "Edible bivalve molluscs" , "Rosy set of odd shellfish" , "Tasty bivalves, may contain pearls" , "Tasty pearl-producing bivalves" , "Succulent bivales" .)

I've seen this clue in The Irish Times.

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