Crossword Genius

Nations in the running (5)

Ross

I believe the answer is:

races

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'nations' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for races that I've seen before include "Competitions; ethnic groups" , "Scare in sporting contests" , "Events at Epsom or Ascot?" , "Speed competitions for various peoples" , "Moves very fast" .)

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