Cryptic crossword clue
Flapping about like Rupert’s trousers? The opposite 9

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

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Buddy explains!

The straight part
We know that "Flapping about" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flapping about = unchecked.
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 UNCHECKED mean?

UNCHECKED adjective
  1. Unrestrained, not held back.
  2. Not examined for accuracy, efficiency, etc.
  3. Of a check box: not checked (ticked or enabled).
  4. (crossword puzzles) Of a square: part of only one entry (that is, across or down, but not both).
UNCHECKED verb
  1. To remove a checkmark.
  2. (travel) To remove a previously checked-in passenger from the check-in system, allowing changes to the ticket.

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