Greek character with thin South American (7)
I believe the answer is:
chilean
'south american' is the definition.
(Chilean is an example)
'greek character with thin' is the wordplay.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'with' says to put letters next to each other.
'thin' becomes 'lean' (synonyms).
'chi'+'lean'='CHILEAN'
(Other definitions for chilean that I've seen before include "From Santiago, say?" , "From e.g. Valparaiso" , "Nationality of citizen of Santiago" , "foreign character" , "Spanish speaker" .)