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All answers having "Make one" as clue:

3 Character Answers:

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WED



4 Character Answers:

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FUSE

JOIN

MELD

SIGN

WELD



5 Character Answers:

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MERGE

UNIFY

UNITE



6 Character Answers:

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BICEPS



8 Character Answers:

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CRANEFLY



10 Character Answers:

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UNDERLYING