South American cowboy (6)
I believe the answer is:
gaucho
'south american cowboy' is the definition.
(term for a cowboy from South America)
This is all the clue.
(Other definitions for gaucho that I've seen before include "Ranch hand" , "Horseman of the Pampas" , "Horseman of the S American plains" , "Cowboy of Argentine's plains" , "plainsman" .)