Cryptic crossword clue
Cleansing procedure riles one swimming in Channel 13

The most common and most likely answer to this crossword clue is the 13 letter word STERILISATION

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Cleansing procedure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cleansing procedure = sterilisation.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does STERILISATION mean?

STERILISATION noun
  1. The process of treating something to kill or inactivate microorganisms.
  2. A procedure to permanently prevent an organism from reproducing.
  3. An instance of a sterilization procedure
  4. A monetary policy operation used to offset a foreign exchange intervention.

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