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All answers having "Seafood dish" as clue:

4 Character Answers:

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CRAB



5 Character Answers:

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SCROD



6 Character Answers:

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SCAMPI



7 Character Answers:

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ABALONE

LOBSTER

MUFFLER



10 Character Answers:

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OYSTERSTEW



11 Character Answers:

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CLAMCHOWDER



12 Character Answers:

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FINNANHADDIE



13 Character Answers:

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CATFISHFILLET

CLAMSMARINARA

CONCHFRITTERS