Sadrists in power here regularly misread question (4)
I believe the answer is:
iraq
'sadrists in power here' is the definition.
(Sadrist Movement is an Iraqi political movement)
'regularly misread question' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'question' becomes 'q'.
The alternate letters of 'misread' are 'ira'.
'ira'+'q'='IRAQ'
(Other definitions for iraq that I've seen before include "Middle Eastern country" , "Where Babylon may be found" , "Middle Eastern nation" , "Country with WMD once?" , "Country containing Basra" .)