Uninterrupted sound on recording (8)
I believe the answer is:
straight
'uninterrupted' is the definition.
(thesaurus)
'sound on recording' is the wordplay.
'sound' becomes 'strait' (strait is a kind of sound).
'on recording' shows a homophone (sound like) (how it might sound on a recording).
'strait' is a homophone of 'STRAIGHT'.
(Other definitions for straight that I've seen before include "Honest - direct" , "Uncurved" , "Without curve or bend" , "Sat right in unbending way" , "Linear" .)