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All answers having "Muddled" as clue:

4 Character Answers:

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ASEA



5 Character Answers:

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ATSEA

FOGGY

WOOZY



6 Character Answers:

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ADDLED

MESSED

SOTTED

TURBID



7 Character Answers:

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BEMUSED

INAMESS

UNCLEAR



8 Character Answers:

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BALLEDUP

CONFUSED

MESSEDUP



10 Character Answers:

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INCOHERENT



11 Character Answers:

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ADDLEHEADED