Unable to hear the fade-out (4)
I believe the answer is:
deaf
'unable to hear' is the definition.
(I've seen this before)
'fade-out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'fade' with letters rearranged gives 'DEAF'.
'the' acts as a link.
(Other definitions for deaf that I've seen before include "Unable to pick up" , "Unhearing" , "like stone?" , "Receiving no sound" , "Deprived of the sense of hearing" .)