Champion more coarse about South American (8)
I believe the answer is:
crusader
'champion' is the definition.
(I've seen this before)
'more coarse about south american' is the wordplay.
'more coarse' becomes 'cruder' ('crude' can be a synonym of 'coarse').
'about' indicates putting letters inside.
'south american' becomes 'SA'.
'cruder' going around 'sa' is 'CRUSADER'.
(Other definitions for crusader that I've seen before include "Richard I, for instance" , "Champion" , "Earnest campaigner" , "Campaigner -- rude scar (anag)" , "Advocate for a cause - rude scar (anag)" .)