Carnival locale (3)
I believe the answer is:
rio
'carnival locale' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rio that I've seen before include "Location of next Olympic Games, in short" , "The ... Grande borders Texas and Mexico" , "Port, -- de Janeiro" , "... Grande, ... de Janeiro" , "old capital" .)