Audible like this note (3)
I believe the answer is:
soh
'note' is the definition.
(a note in the do-re-mi system)
'audible like this' is the wordplay.
I cannot really see how this works, but
'like this' could be 'so' ('like so') and 'so' is present in the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for soh that I've seen before include "Note of major scale" , "5th musical note" , "element of scale" , "Doh ray me fah . . ." , "Note; sounds like darn" .)