Found in bed they're eaten alive (7)

I believe the answer is:

oysters

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If this is the answer I cannot explain how the clue works.

(Other definitions for oysters that I've seen before include "Yet Ross finds these marine creatures" , "they get eaten by the dozen" , "Yet Ross, strangely, has the marine creatures" , "Shy people" , "Edible bivalve molluscs" .)

I've seen this clue in The Globe and Mail.

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