What does the cryptic crossword clue "American laboratory’s American mission: blocking defeat (9)" 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.

American laboratory’s American mission: blocking defeat (9)

Independent Cryptic #12086 | 25 Across | 2025-07-04 flower

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