Gal so rich upset a few rulers? (9)

I believe the answer is:

oligarchs

'a few rulers?' is the definition.
(small group of powerful people)

'gal so rich upset' is the wordplay.
'upset' indicates an anagram.
'gal'+'so'+'rich'='galsorich'
'galsorich' is an anagram of 'OLIGARCHS'.

(Other definitions for oligarchs that I've seen before include "governors" , "Influential businessmen" .)

I've seen this clue in The Times.

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