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All answers having "Cleave" as clue:

3 Character Answers:

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HEW

RIP



4 Character Answers:

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CHOP

PART

REND

RIVE

SLIT



5 Character Answers:

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SEVER

SHEAR

SPLIT

STICK



6 Character Answers:

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ADHERE



9 Character Answers:

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SPLITOPEN



13 Character Answers:

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ADHEREORSPLIT