Spanish river (3)
I believe the answer is:
rio
'spanish river' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rio that I've seen before include "Location of next Olympic Games, in short" , "- Ferdinand, footballer" , "old capital" , "(Golfer) in the sand" , "Flying Down to -, Astaire, Rogers film" .)