Feature film doesn't include fateful Arabian ruler (4)

I believe the answer is:

emir

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'arabian ruler' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for emir that I've seen before include "Title of various rulers; I'm ER (anag.)" , "leader in the East" , "Arab ruler" , "Leading role" , "Eastern ruler in mire" .)

I've seen this clue in the Irish Times.

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