Assassination of character broadcast to Mafia hiding in a secluded place (10)
I believe the answer is:
defamation
'assassination of character' is the definition.
(I've seen this before)
'broadcast to mafia hiding in a secluded place' is the wordplay.
'broadcast' indicates an anagram (letters scattered or cast around).
'hiding in' means one lot of letters goes inside another.
'a secluded place' becomes 'den' (den is a kind of place. I am not sure about the 'secluded' bit.).
'to'+'mafia'='tomafia'
'tomafia' with letters rearranged gives 'famatio'.
'famatio' going into 'den' is 'DEFAMATION'.
Can you help me to learn more?
(Another definition for defamation that I've seen is " Assassination of character".)