Cryptic crossword clue
Rule found by officer to stop airship heading off is not able to be changed

The most common and most likely answer to this crossword clue is the 12 letter word INCORRIGIBLE

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

The straight part
We know that "not able to be changed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not able to be changed = incorrigible.
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 INCORRIGIBLE mean?

INCORRIGIBLE noun
  1. An incorrigibly bad individual.
INCORRIGIBLE adjective
  1. Defective and impossible to materially correct or set aright.
  2. Incurably depraved; not reformable.
  3. Impervious to correction by punishment or pain.
  4. Unmanageable.
  5. Determined, unalterable, hence impossible to improve upon.
  6. Incurable.

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