What does the cryptic crossword clue "EU's regret over drug (8)" mean?

The definition is "EU's". The wordplay uses a charade (building blocks). RUE (synonym of "regret") + OPIUM (synonym of "drug"); definition: "EU's" The answer is EUROPIUM.

EU's regret over drug (8)

Guardian Cryptic #27498 | 2 Down | 2018-05-02 flower

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