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All answers having "Fuse" as clue:

3 Character Answers:

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CON

WED



4 Character Answers:

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FRIT

JOIN

MARK

MELD

MELT

WELD



5 Character Answers:

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BLEND

BLOWA

MERGE

RUCHE

SMELT

UNIFY

UNITE



6 Character Answers:

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SOLDER



7 Character Answers:

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ARCWELD

PAYLOAD



8 Character Answers:

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COALESCE



9 Character Answers:

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DETONATOR



10 Character Answers:

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AMALGAMATE