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All answers having "Impediment" as clue:

3 Character Answers:

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BAR

LET

OAF

RUB



4 Character Answers:

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SNAG



6 Character Answers:

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ANNUAL



8 Character Answers:

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DRAWBACK

ESTOPPEL

OBSTACLE



9 Character Answers:

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HINDRANCE

STUMBLING



12 Character Answers:

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COUNTERPOISE



14 Character Answers:

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STUMBLINGBLOCK