Cunning, intervening in any disorder (7)
I believe the answer is:
anarchy
'disorder' is the definition.
(I know that anarchy is a type of disorder)
'cunning intervening in any' is the wordplay.
'cunning' becomes 'arch' (arch can mean cunning or tricksy).
'intervening in' is an insertion indicator.
'arch' inserted within 'any' is 'ANARCHY'.
(Other definitions for anarchy that I've seen before include "State of civil disorder" , "General disorder" , "Utter lawlessness" , "Collapse of order, rule" , "State of lawlessness and disorder" .)