Crossword Genius

Kind of Rugby League (5)

Ross

I believe the answer is:

union

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for union that I've seen before include "Equity is one" , "Wedding, say" , "Big old pearl" , "Trade organisation to represent workers" , "Agreement -- wedlock" .)

I've seen this clue in The Independent.
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