Newspaper cut up about leader in general — bother! (5)
I believe the answer is:
aggro
'bother' is the definition.
(short for aggression)
I don't understand the rest of the clue.
(Other definitions for aggro that I've seen before include "Attacking behaviour" , "Big trouble" , "Slang for deliberate trouble-making" , "Violence - obstructiveness" , "Yobbish violence" .)