Crossword Genius

Leave behind urn? (6)

Ross

I believe the answer is:

outrun

'leave behind' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for outrun that I've seen before include "Go faster than, on the gallop" , "Go faster than as in foot race" , "Be too fast for on foot" , "Overtake, escape" , "Lose" .)

I've seen this clue in The Guardian.
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