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All answers having "Overturn" as clue:

3 Character Answers:

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TIP



4 Character Answers:

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CANT

EASY

FLIP

UEND

UNDO



5 Character Answers:

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DETER

SCRAP

UPEND

UPSET



6 Character Answers:

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EXEMPT

NEGATE

REPEAL

TOPPLE



7 Character Answers:

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CAPSIZE

OVERDUE

RESCIND