Former Iranian ruler (4)

I believe the answer is:

shah

'former iranian ruler' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for shah that I've seen before include "Iranian emperor" , "Former hereditary monarch of Iran" , "Former Persian ruler" , "Title of Iranian monarch" , "Emperor of Iran" .)

I've seen this clue in the Evening Standard, the Newsday, the Penny Press, The Sun, the LA Times, the Universal and The Times.

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