Disorder is rampant on street (6)
I believe the answer is:
strife
'disorder' is the definition.
(strife is a kind of disorder)
'rampant on street' is the wordplay.
'rampant' becomes 'rife'.
'on' means one lot of letters go next to another.
'street' becomes 'st'.
'rife' put after 'st' is 'STRIFE'.
'is' is the link.
(Other definitions for strife that I've seen before include "Trouble and discord" , "Bitter disagreement" , "Heated discord" , "Bitter conflict" , "Trouble and conflict" .)