Crossword Genius

S American river (3)

Ross

I think it could be either:

Which length description are you looking for?:

3

6

(Other definitions for rio that I've seen before include "A Mexican river, may be grande" , "Location of next Olympic Games, in short" , "place of carnival" , "Flying Down to -, Astaire, Rogers film" , "- Ferdinand, footballer" .)

I've seen this clue in the Sydney Morning Herald.
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