Current measure blocking fashion for disorderly behaviour (7)
I believe the answer is:
rampage
'disorderly behaviour' is the definition.
(rampaging is disorderly or violent behaviour)
'current measure blocking fashion' is the wordplay.
'current measure' becomes 'amp' (short for ampere, unit of electrical current).
'blocking' means one lot of letters goes inside another.
'fashion' becomes 'rage' (something all the rage is fashionable).
'amp' put into 'rage' is 'RAMPAGE'.
'for' is the link.
(Other definitions for rampage that I've seen before include "Fury" , "Run amok" , "Violent rush" , "destructive behaviour" , "Destructive spree" .)