Cryptic crossword clue
Remover of pathogens transferring parasites in and out 14

The most common and most likely answer to this crossword clue is the 14 letter word PASTEURISATION

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Remover of pathogens" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case remover of pathogens = pasteurisation.
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 PASTEURISATION mean?

PASTEURISATION noun
  1. Heat-treatment of a perishable food to destroy heat-sensitive vegetative cells followed by immediate cooling to limit growth of the surviving cells and germination of spores.

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