Host city of the 2016 Olympic Games (3,2,7)
(Other definitions for rio de janeiro that I've seen before include "long-haul holiday destination" , "Brazilian carnival city" , "foreign port" , "place" , "Brazilian port and former capital" .)
(Other definitions for rio that I've seen before include "Erstwhile home of Biggs" , "Manchester United player in South American city, in short?" , "Flying Down to -, Astaire, Rogers film" , "A Mexican river - like Grande" , "(Golfer) in the sand" .)