Side in 1980s war (4)

I believe the answer is:

iran

(Other definitions for iran that I've seen before include "It used to be Persia" , "Country where the official language is Farsi" , "Persia today" , "It was known as Persia until 1935" , "Modern Persia (4)" .)

I've seen this clue in the Thinks.com.

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