Crossword Genius

Very long race (8)

Ross

I believe the answer is:

marathon

(Other definitions for marathon that I've seen before include "Long-distance running event" , "Footrace of 26 miles 385 yards" , "strenuous event" , "Pheidippides' starting point" , "Severe test of endurance" .)

I've seen this clue in the L.A. Times Daily, The Washington Post and The Mirror.
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