Refuse to acknowledge uproar about broadcast (6)
I believe the answer is:
disown
'refuse to acknowledge' is the definition.
(I've seen this before)
'uproar about broadcast' is the wordplay.
'uproar' becomes 'din' (I've seen this in other clues).
'about' indicates putting letters inside.
'broadcast' becomes 'sow' (sowing is a kind of broadcasting).
'din' placed around 'sow' is 'DISOWN'.
(Other definitions for disown that I've seen before include "Refuse to be associated with (a person)" , "Disclaim all connection or relationship with" , "Repudiate - disinherit" , "Refuse to have anything to do with" , "Disinherit or renounce" .)