Order in some dictionaries (5)
I believe the answer is:
edict
'order' is the definition.
(I know that order can be written as edict)
'in some dictionaries' is the wordplay.
'in' says the answer is hidden in the clue.
'EDICT' can be found hidden inside 'some dictionaries'.
(Other definitions for edict that I've seen before include "Cited an official proclamation" , "Declaration" , "Cited (anag) - proclamation" , "Legally binding proclamation" , "Authoritative ruling" .)