The most common and most likely answer to this crossword clue is the 9 letter word HUSH-HUSH
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Buddy explains!
The straight part
We know that "/Quiet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case /quiet = hush-hush.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.
Crossword Answer definitions
HUSH-HUSH noun- Secrecy; covert operation
- Secret, not spoken of (or spoken of only in hushed whispers between insiders).