Refuse to accept broadcast restricted by noise (6)
I believe the answer is:
disown
'refuse to accept' is the definition.
(to disown is to reject or refuse)
'broadcast restricted by noise' is the wordplay.
'broadcast' becomes 'sow' (sowing is a kind of broadcasting).
'restricted by' means one lot of letters goes inside another (I've seen this in other clues).
'noise' becomes 'din' (din is a kind of noise).
'sow' inserted within 'din' is 'DISOWN'.
(Other definitions for disown that I've seen before include "Refuse to have anything to do with" , "Deny any connection with" , "Abnegate" , "Forsake" , "Repudiate, cast off" .)