Man overlooking article on a South American country (6)
I believe the answer is:
guyana
'south american country' is the definition.
(country in South America)
'man overlooking article on a' is the wordplay.
'man' becomes 'guy' (guy is a kind of man).
'overlooking' means one lot of letters go next to another (in a down clue, some letters go above others).
'article' becomes 'an' (English indefinite article).
'on' is a charade indicator (letters next to each other).
'guy'+'an'+'a'='GUYANA'
(Other definitions for guyana that I've seen before include "South American republic" , "Cricket-playing country" , "South American country, a British colony until 1966" , "Off the north coast of S. America, the capital is Georgetown" , "Country of S. America" .)