Decree cited in error (5)
I believe the answer is:
edict
'decree' is the definition.
(synonyms)
'cited in error' is the wordplay.
'in error' is an anagram indicator.
'cited' is an anagram of 'EDICT'.
(Other definitions for edict that I've seen before include "Decree by authority" , "Cited an official proclamation" , "Formal order" , "Regulation" , "Pronouncement" .)