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All answers having "Sea duck" as clue:

4 Character Answers:

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BYTE

COOT

LIAR

MAIL

SMEW



5 Character Answers:

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EIDER

SCAUP

USEUP

WONKY



6 Character Answers:

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CRAVAT

OFFSET

ORIGIN

RAISIN

SCOTER

SHANDY

SWATHE



7 Character Answers:

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MADEIRA

REPLICA



8 Character Answers:

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OBSTRUCT



10 Character Answers:

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CHIVALROUS