Disorder law catching politician (6)
I believe the answer is:
rumple
'disorder' is the definition.
(thesaurus)
'law catching politician' is the wordplay.
'law' becomes 'rule' (rule is a kind of law).
'catching' indicates putting letters inside.
'politician' becomes 'mp'.
'rule' placed around 'mp' is 'RUMPLE'.
(Other definitions for rumple that I've seen before include "Disturb the smoothness" , "disorder" , "mess" , "Dishevel, ruffle" , "Make untidy, say clothes" .)