28 across
Crude
oil
charge
mostly
makes
wealthy
and
powerful
individual
(8)
Crude oil charge mostly makes wealthy and powerful individual (8)
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The definition is at the end of the clue.
How the clue works
Look at makes wealthy and powerful individual — that's your definition. "Crude" is your anagram indicator, and it's working on OIL plus CHARGE minus its last letter (that's what "mostly" does to it, giving you CHARG), and jumbling those letters together gives you your answer.