Part of the circle raised in theocracy (3)
I believe the answer is:
arc
'part of the circle' is the definition.
('arc' is part of 'circle')
'raised in theocracy' is the wordplay.
'raised' shows that the letters should be reversed in order.
'in' indicates a hidden word.
'cra' can be found hidden inside 'theocracy'.
'cra' backwards is 'ARC'.
(Other definitions for arc that I've seen before include "section of Circle Line" , "development of plot" , "Turn" , "Part of a circle's circumference" , "Curve of car" .)