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All answers having "Unite" as clue:

3 Character Answers:

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TIE

WED



4 Character Answers:

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ALLY

FUSE

JOIN

KNIT

LINK

MELD

WELD



5 Character Answers:

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CLOSE

MARRY

MERGE

UNTIE



6 Character Answers:

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CEMENT

COUPLE

JOINTO

PAIRUP

SPLICE



7 Character Answers:

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COMBINE

CONJOIN

CONNECT



8 Character Answers:

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COAGMENT

COALESCE

FEDERATE



10 Character Answers:

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AMALGAMATE

JOINFORCES



11 Character Answers:

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CONSOLIDATE