Russian edict (5)
I believe the answer is:
ukase
'russian edict' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ukase that I've seen before include "Decree or edict from Russia" , "Decree (originally from the Tsar)" , "Tsarist edict with the force of law" , "Russian imperial decree" , "Imperial decree in Tsarist Russia" .)