An audio fault, but it means success (3)
I believe the answer is:
wow
'success' is the definition.
(I have seen 'Huge success' mean 'wow' so perhaps 'success' could also mean 'wow')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for wow that I've seen before include "Cor! - huge success" , "Great success" , "Palindromic exclamation of surprise or admiration" , "Expression of surprised admiration" , "that's incredible!" .)