Statesman, something of an egomaniac (5)

I believe the answer is:

omani

'statesman' is the definition.
(person from Oman)

'something of an egomaniac' is the wordplay.
'something of' indicates the answer is hidden within the clue (I've seen 'something' mean this (I've seen this in other clues)).
'OMANI' can be found hidden inside 'egomaniac'.

(Other definitions for omani that I've seen before include "Gulf native" , "Native of one Arabian sultanate" , "one from the Middle East" , "Gulf Arab" , "M East person" .)

I've seen this clue in The Guardian.

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