Crossword Genius

Guanabara Palace city (3)

Ross

I believe the answer is:

rio

(Other definitions for rio that I've seen before include "The ... Grande borders Texas and Mexico" , "Manchester United player in South American city, in short?" , "Flying Down to -, Astaire, Rogers film" , "A Mexican river, may be grande" , "Brazilian city and port" .)

I've seen this clue in The Washington Post.
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