Take to court, involving one embracing mostly violent activity (8)
I believe the answer is:
thuggery
'violent activity' is the definition.
(violent or thuggish behaviour)
'take to court involving one embracing mostly' is the wordplay.
'take to court' becomes 'try' (as in trying someone in court).
'involving' indicates putting letters inside.
'one embracing' becomes 'hugger' (someone who hugs).
'mostly' means to remove the last letter.
'hugger' with its final letter removed is 'hugge'.
'try' placed around 'hugge' is 'THUGGERY'.
(Other definitions for thuggery that I've seen before include "ruffianism" , "Yobbish violence" , "Brutal behaviour" , "Aggressive violence" , "Bullying" .)