The most common and most likely answer to this crossword clue is the 9 letter word ANTINOISE
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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 ANTINOISE mean?
ANTINOISE noun- A sound wave, of the same amplitude but of opposite phase to that of an unwanted sound, that can neutralize the unwanted sound using destructive interference.
- Intended to reduce environmental noise.
- Capable of neutralizing a noise.