Emperor we’re told grants audience to a king (6)

I believe the answer is:

caesar

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'emperor' is the definition.
(title used by Roman emperors)

I don't understand the rest of the clue.

(Other definitions for caesar that I've seen before include "Title of the Roman emperors" , "Emperor of ancient Rome, like Julius" , "A scare for Roman emperor" , "Old Roman emperor like Julius" , "US comedian" .)

I've seen this clue in The Times.

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