I'd rise up over authoritarian region (8)
I believe the answer is:
district
'region' is the definition.
(I know that district is a type of region)
'i'd rise up over authoritarian' is the wordplay.
'rise up' shows that the letters should be reversed in order (I've seen 'rising up' mean this (in a down clue, letters go up)).
'over' means one lot of letters go next to another (in a down clue, some letters go over others).
'authoritarian' becomes 'strict' (I've seen this before).
'id' reversed gives 'di'.
'di'+'strict'='DISTRICT'
(Other definitions for district that I've seen before include "Area, region" , "Territorial division" , "Region marked off for administrative or other purposes" , "Area (of a town/city)" , "London Underground line represented in green" .)