Time when the hands come together (6)

I believe the answer is:

twelve

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'together' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for twelve that I've seen before include "houses in a year?" , "[MIDNIGHT], perhaps" , "Number of Apostles" , "Last hour" , "Lunchtime" .)

I've seen this clue in The Globe and Mail, The Guardian and The Telegraph.

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