Crossword Genius

Track for an athlete (6)

Ross

I believe the answer is:

runner

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'athlete' is the definition.
(runner is a kind of athlete)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for runner that I've seen before include "Smuggler; a bean" , "Harrier" , "Viable idea" , "Green vegetable" , "Horse in a race; shoot" .)

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