Hate speech perhaps gets Mike arrested by police with violence (7)
I believe the answer is:
polemic
'hate speech perhaps' is the definition.
(a polemic is a controversial piece of writing)
'mike arrested by police with violence' is the wordplay.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'arrested by' indicates putting letters inside (I've seen this in other clues).
'with violence' indicates anagramming the letters.
'police' with letters rearranged gives 'poleic'.
'm' placed inside 'poleic' is 'POLEMIC'.
'gets' acts as a link.
(Other definitions for polemic that I've seen before include "Compile to make verbal attack on belief" , "Controversial writing or oratory" , "Involving controversy -- compile (anag)" , "Controversy; attacking speech" , "debate" .)