Cryptic crossword clue
Immunised cleaner can’t die sweeping 10

The most common and most likely answer to this crossword clue is the 10 letter word VACCINATED

I've seen this crossword clue in Financial Times
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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 VACCINATED mean?

VACCINATED verb
  1. Treat with a vaccine to produce immunity against a disease.

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