What does the cryptic crossword clue "Polluted: "No Admittance" order required (12)" 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.

Polluted: "No Admittance" order required (12)

Guardian Cryptic #24476 | 18 Across | 2008-08-25 flower

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