Feud led bishop to stir disorder (8)
I believe the answer is:
befuddle
'disorder' is the definition.
(thesaurus)
'feud led bishop to stir' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'to stir' is an anagram indicator.
'feud'+'led'+'b'='feudledb'
'feudledb' is an anagram of 'BEFUDDLE'.
(Other definitions for befuddle that I've seen before include "Baffle" , "puzzle" , "Cause to become unable to think clearly" , "Perplex" , "Make stupefied" .)