Posted order from dictator (6)
I believe the answer is:
Here is my best explanation:
'dictator' is the definition.
(despot is a kind of dictator)
'posted order' is the subsidiary indication.
'order' indicates anagramming the letters.
'posted' anagrammed gives 'despot'.
'from' is the link.
(Other definitions for despot that I've seen before include "Person with more than enough power", "Cruel and oppressive ruler", "monster?", "Tyrant, slave driver", "nasty ruler?", "Arbitrary ruler", "has first of shocks in store", "Authoritarian", "Oppressor" and "who treats others badly?".)