Crossword Genius

Where Farsi is the national language (4)

Ross

I believe the answer is:

iran

(Other definitions for iran that I've seen before include "Rain (anag) - country" , "Nation" , "It was known as Persia until 1935" , "Persia some time ago" , "Country of western Asia" .)

I've seen this clue in the USA Today.
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