Order cited in new order (5)
I believe the answer is:
edict
'order' is the definition.
(synonyms)
'cited in new order' is the wordplay.
'in new order' indicates an anagram (I've seen this in other clues).
'cited' anagrammed gives 'EDICT'.
(Other definitions for edict that I've seen before include "Formal proclamation" , "Decree, fiat" , "Cited (anag) - proclamation" , "Formal announcement" , "Legally binding command" .)