Crossword Genius

2016 Summer Olympics host, informally (3)

Ross

I believe the answer is:

rio

(Other definitions for rio that I've seen before include "Manchester United player in South American city, in short?" , "... Grande, ... de Janeiro" , "A Mexican river, may be grande" , "The ... Grande borders Texas and Mexico" , "place of carnival" .)

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