What does the cryptic crossword clue "Spring containing unrefined petroleum (8)" mean?

The definition is "petroleum". The wordplay uses charade, container. COIL (synonym of "Spring") + RUDE (synonym of "unrefined") [container: "containing"]; definition: "petroleum" The answer is CRUDEOIL.

Spring containing unrefined petroleum (8)

Independent Cryptic #11944 | 9 Across | 2025-01-20 flower

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