Cryptic crossword clue
Or lunatics can make sounds which are of a frequency too high to be audible 10

The most common and most likely answer to this crossword clue is the 10 letter word ULTRASONIC

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Buddy explains!

The straight part
We know that "frequency too high to be audible" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case frequency too high to be audible = ultrasonic.
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 ULTRASONIC mean?

ULTRASONIC adjective
  1. (acoustics) Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.

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