Loutish behaviour (7)
I believe the answer is:
yobbery
'loutish behaviour' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for yobbery that I've seen before include "Beer-fuelled behaviour" , "Inclination to act loutishly" , "Rude noisy behaviour" , "Loutish behaviour" , "antisocial behaviour" .)