What does the cryptic crossword clue "Canned eels can have a purifying effect (7)" 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.

Canned eels can have a purifying effect (7)

Guardian Cryptic #28373 | 20 Down | 2021-02-19 flower

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