Ottoman governor, formerly a pop star (7)

I believe the answer is:

beyonce

'a pop star' is the definition.
(US singer Beyonce Knowles)

'ottoman governor formerly' is the wordplay.
'ottoman governor' becomes 'bey' (I've seen this in another clue).
'formerly' becomes 'once' (synonyms).
'bey'+'once'='BEYONCE'

(Another definition for beyonce that I've seen is " Destiny's Child".)

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