Audible cast, from beginning to end (7)
I believe the answer is:
through
'from beginning to end' is the definition.
(I've seen this before)
'audible cast' is the wordplay.
'audible' shows a homophone (sound like).
'cast' becomes 'threw' (I've seen this before).
'threw' is a homophone of 'THROUGH'.
(Other definitions for through that I've seen before include "By means of - by way of" , "No longer going out together" , "Using" , "From beginning to end" , "As a result of" .)