South American cowboy (6)
I believe the answer is:
gaucho
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">south american cowboy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(term for a cowboy from South America)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)