Former Persian ruler (4)

I believe the answer is:

shah

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

This is all the clue.

(Other definitions for shah that I've seen before include "Former Persian title" , "King of Persia" , "Former ruler of Iran" , "Sovereign ousted in 1979" , "Former Persian ruler" .)

I've seen this clue in The Times.

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