Country man in Iran upset by American (9)
I believe the answer is:
argentina
'country' is the definition.
(Argentina is an example)
'man in iran upset by american' is the wordplay.
'man' becomes 'gent' (gent is a kind of man).
'in' is an insertion indicator.
'upset by' is an anagram indicator.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'iran' with letters rearranged gives 'arin'.
'gent' put into 'arin' is 'argentin'.
'argentin'+'a'='ARGENTINA'
(Other definitions for argentina that I've seen before include "Its capital Buenos Aires" , "South American country" , "state" , "Home of the tango" , "FIFA World Cup winners in 1978 and 1986" .)