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All answers having "Edible mollusc" as clue:

4 Character Answers:

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COAX



5 Character Answers:

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CRUMB

DREAD

ENOKI

MOCHA

ORMER

SQUID

WHELK



6 Character Answers:

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COCKLE

ENZYME

MUSSEL

OYSTER



7 Character Answers:

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ABALONE

HIRSUTE

OCTOPUS

SCALLOP

YFRONTS