Rugby players go over for them (5)

I believe the answer is:

tries

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'rugby players' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tries that I've seen before include "Attempts" , "Scoring moves in rugby" .)

I've seen this clue in the Evening Standard.

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