Disorder due to 1001 new rules (7)
I believe the answer is:
misrule
'disorder' is the definition.
(I've seen this in another clue)
'1001 new rules' is the wordplay.
'1001' becomes 'mi' (I've seen this in other clues).
'new' is an anagram indicator.
'rules' with letters rearranged gives 'srule'.
'mi'+'srule'='MISRULE'
'due to' is the link.
(Other definitions for misrule that I've seen before include "Disorder (lord of)" , "Bad government" , "Unfair government; disorder" .)