What does the cryptic crossword clue "Smelly substance found in diesel emissions (5)" 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.

Smelly substance found in diesel emissions (5)

Guardian Cryptic #29827 | 26 Across | 2025-10-16 flower

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