Not all topics on the radio involve violent disagreement! (3-2)
I believe the answer is:
set-to
'disagreement' is the definition.
(a 'set to' is an argument)
'not all topics on the radio involve violent' is the wordplay.
I cannot quite see how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'radio' could be 'set' (I've seen this in other clues) and 'set' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for set-to that I've seen before include "Altercation" , "Brief fight" , "Fight, argument" , "brush with violence?" , "Disagreement, fight" .)