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All answers having "Joins" as clue:

4 Character Answers:

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ADDS

TIES

WEDS



5 Character Answers:

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ABUTS

FUSES

KNITS

WELDS

YOKES



6 Character Answers:

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ENTERS

TENONS

TIESTO

UNITES



7 Character Answers:

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CEMENTS

COUPLES

ENLISTS

ENROLLS

SOLDERS

SPLICES

UNIFIES



8 Character Answers:

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CONNECTS

ENTERSIN

GETSINON

OPTSINTO

OPTSINTO

REUNITES