What does the cryptic crossword clue "Possibly made radioactive, so no admittance, unfortunately (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.

Possibly made radioactive, so no admittance, unfortunately (12)

Guardian Cryptic #29931 | 12 Across | 2026-02-16 flower

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