What does the cryptic crossword clue "Mixing lab acid with oil could be fiendish (10)" 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.

Mixing lab acid with oil could be fiendish (10)

Times Sunday #5110 | 11 Across | 2024-05-05 flower

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