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All answers having "Passable" as clue:

4 Character Answers:

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COPY

FAIR

ODDS

OKAY

PUCK

SOSO



5 Character Answers:

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FLATS

LAPEL

UTURN



6 Character Answers:

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GANNET

NOTBAD



8 Character Answers:

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ADEQUATE

NOTGREAT



11 Character Answers:

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HAMMERDRILL



12 Character Answers:

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SATISFACTORY



14 Character Answers:

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FAIRTOMIDDLING