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All answers having "Slack" as clue:

3 Character Answers:

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LAX



4 Character Answers:

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CULM

DULL

EASE

GIVE

LIMP



5 Character Answers:

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GOFAR

LOOSE



6 Character Answers:

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LEEWAY

REMISS



7 Character Answers:

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FLACCID



9 Character Answers:

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NEGLIGENT