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All answers having "Stoop" as clue:

3 Character Answers:

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BOW



4 Character Answers:

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BEND



5 Character Answers:

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DEIGN

PORCH



6 Character Answers:

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CROUCH

STAIRS



7 Character Answers:

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DESCEND



8 Character Answers:

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BENDOVER

LEANOVER

OVERBEND



9 Character Answers:

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OLDMASTER



10 Character Answers:

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CONDESCEND