Mollusk (6)
'mollusk' is the definition.
(I know that oyster is a type of bivalve)
This is all the clue.
(Other definitions for oyster that I've seen before include "one got out of bed?" , "Mollusc with shucks" , "Pearl creator" , "Greyish pink" , "Shade of greyish white" .)
'mollusk' is the definition.
(I know that scallop is a type of bivalve)
This is the entire clue.
(Other definitions for scallop that I've seen before include "Marine mollusc" , "Mollusc or lacy edge" , "Shellfish - badge worn by pilgrims to Santiago de Compostela" , "Shell - sign of a pilgrim" , "Marine bivalve" .)
'mollusk' is the definition.
(clam is a kind of mollusk)
This is all the clue.
(Other definitions for clam that I've seen before include "shy person" , "Mollusc, one proverbially reticent" , "Large bivalve mollusc" , "Mollusc with firmly-closed shell" , "Large marine bivalve" .)