Organised riot, neat attack (4,4)
I believe the answer is:
tear into
'attack' is the definition.
(I've seen this in another clue)
'organised riot neat' is the wordplay.
'organised' indicates an anagram.
'riot'+'neat'='riotneat'
'riotneat' with letters rearranged gives 'TEAR INTO'.
(Other definitions for tear into that I've seen before include "handbag" , "Scold furiously" , "Attack verbally" .)