Crossword Genius

Annual 500-mile car race, for short (4)

Ross

I believe the answer is:

indy

(Other definitions for indy that I've seen before include "A US motor sport" , "Form of competition between drivers" , "Racing in fast cars" , "US motor-racing" , "- - Car racing (in US)" .)

I've seen this clue in the Newsday.
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