Drunken senator broadcast betrayal (4,7)
I believe the answer is:
high treason
'broadcast betrayal' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'drunken senator' is the wordplay.
I cannot really see how this works, but
'drunken' could be 'high' (high can informally mean drunk) and 'high' is located in the answer.
an anagram of 'senator' is 'treason' which is within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for high treason that I've seen before include "Capital offence" , "crime against the state?" , "Betrayal of one's country" .)