A right fellow to have in a country (9)
I believe the answer is:
argentina
'country' is the definition.
(I know that Argentina is a South American country)
'a right fellow to have in a' is the wordplay.
'a right fellow' becomes 'argent' (I can't justify this - if you can you should give a lot more credence to this answer).
'to have' means one lot of letters go next to another.
'argent'+'in'+'a'='ARGENTINA'
(Other definitions for argentina that I've seen before include "state" , "part of 18 [SOUTH AMERICA]" , "Home of the tango" , "An ingrate in S American country" , "Evita's country" .)