Iran's official language (5)

I believe the answer is:

farsi

'iran's official language' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for farsi that I've seen before include "Modern Persian lang." , "Iranian language, also widely spoken in Afghanistan" , "Persian language" , "Iran's official language" , "foreign language" .)

I've seen this clue in the Universal and The Sunday Times.

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