Crossword Genius

What hits the ground running? (4)

Ross

I believe the answer is:

sole

(Other definitions for sole that I've seen before include "O __ Mio (Neapolitan song)" , "A lone sort of fish - lose it" , "Flatfish; exclusive" , "Lone; part of foot" , "swimmer" .)

I've seen this clue in The New York Times.
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