What does the cryptic crossword clue "Wealthy sort one in mineral oil refinement? (11)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Wealthy sort one in mineral oil refinement? (11)

Times Cryptic #28526 | 11 Down | 2023-02-14 flower

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