Pampas cowboy (6)
I believe the answer is:
gaucho
'pampas cowboy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for gaucho that I've seen before include "Cowboy of the South American pampas" , "Plain-living person" , "Ranch hand" , "Argentinian cattle-herder" , "A cough (anag)" .)