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All answers having "Join together" as clue:

3 Character Answers:

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ADD

SEE

TIE

WED



4 Character Answers:

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FUSE

KNIT

MELD

POOL

RAVE

SCAM

SEAM

TEAM

WELD

YOKE



5 Character Answers:

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LLAMA

MERGE

STAFF

TIEIN

UNITE



6 Character Answers:

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CEMENT

COUPLE

FASTEN

SLEEPY

SPLICE

TEAMUP



7 Character Answers:

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CODEINE

COMBINE

CONNECT

LEXICON

LOGICAL

REFLECT

WALLOON



8 Character Answers:

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ILLTREAT



9 Character Answers:

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EDINBURGH

ETYMOLOGY



12 Character Answers:

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WINTERSPORTS



13 Character Answers:

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INBRONZEMEDAL