A vacuous gang men turned over for violent conduct (5)
I believe the answer is:
aggro
'violent conduct' is the definition.
'aggro' can be an answer for 'conduct' (aggro is a kind of conduct). I'm not sure about the 'violent' bit.
'a vacuous gang men turned over' is the wordplay.
'vacuous' suggests removing the centre.
'men' becomes 'or' (military abbreviation for Other Ranks).
'turned over' shows that the letters should be reversed in order.
'gang' with its middle removed is 'gg'.
'or' reversed gives 'ro'.
'a'+'gg'+'ro'='AGGRO'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for aggro that I've seen before include "Difficulties (slang)" , "Big trouble" , "Difficulties (sl.)" , "belligerent troublemaking" , "Attacking behaviour" .)