Murderous graduate given hearing stopped by police (10)

'murderous' is the definition.
(matricide is murder of one's mother)

'graduate given hearing stopped by police' is the wordplay.
'graduate' becomes 'ma' (abbreviation for Master of Arts).
'given' says to put letters next to each other.
'hearing' becomes 'trial' (I've seen this before).
'stopped by' is an insertion indicator (I've seen this in other clues).
'police' becomes 'cid' (abbreviation for Criminal Investigation Department).
'trial' going around 'cid' is 'tricidal'.
'ma'+'tricidal'='MATRICIDAL'