Cryptic crossword clue
Treat with powerful agent organised in European zoos 7

The most common and most likely answer to this crossword clue is the 7 letter word OZONISE

I've seen this crossword clue in The Times
O
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The straight part
We know that "Treat with powerful agent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case treat with powerful agent = ozonise.
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 OZONISE mean?

OZONISE verb
  1. To treat or react with ozone; to ozonate
  2. To convert oxygen into ozone, especially by using an ozonizer

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