It's south of Georgia (4)
I believe the answer is:
'it's south of georgia' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iran that I've seen before include "It was known as Persia until 1935" , "Country of western Asia" , "Tehran is its capital" , "bombless state" , "Farsi-speaking country" .)