What does the cryptic crossword clue "Hero engages US criminal in cause of climate change (10,3)" 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.

Hero engages US criminal in cause of climate change (10,3)

Daily Mail Cryptic #16644 | 15 Across | 2021-08-18 flower

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