Cryptic crossword clue
In dons’ room fitter installs minute security device 9

The most common and most likely answer to this crossword clue is the 9 letter word SCRAMBLER

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "security device" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case security device = scrambler.
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 SCRAMBLER mean?

SCRAMBLER noun
  1. Someone or something that scrambles (in various senses).
  2. A vine that does not attach itself to its supports.
  3. A device that makes messages intentionally, but reversibly, unintelligible for reasons of privacy or security.
  4. A motorcycle used for motocross.

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