An edible, marine, bivalve mollusc (6)

I believe the answer is:

oyster

(Other definitions for oyster that I've seen before include "Bivalve - may be pearl carrier" , "offers all one could desire" , "one got out of bed?" , "Shellfish - colour" , "Pearl-generating bivalve" .)

I've seen this clue in the Sydney Morning Herald.

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