Crossword Genius

One joining football club the last to get changed (6)

Ross

I believe the answer is:

uniter

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'one joining' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for uniter that I've seen before include "one getting married, perhaps" , "one joining" .)

I've seen this clue in The Guardian.
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