The most common and most likely answer to this crossword clue is the 9 letter word NOISELESS
I've seen this crossword clue in The Sunday Telegraph
N
O
I
S
E
L
E
S
S
More clues leading to the result NOISELESS
- Sister oddly wound up mute
- Unable to pick up scent, maybe, around beginning of investigation, so quiet
- Lionesses interfered with mum?
- . Is Head of Eton stopping lesson being broadcast still?
- Still one is drunk by bar
- Losing unfurled umbrella, Simon Russell Beale unusually quiet
- Back injury — ending for female’s mum?
- Silent first officer, inept to forget uniform
- Scenting nothing evidently, one kept quiet
- Playful lionesses must be quiet
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 = noiseless.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 NOISELESS mean?
NOISELESS adjective- Producing no noise; without noise.