Political party affected punishment regime (6,4)
I believe the answer is:
labour camp
'punishment regime' is the definition.
The definition suggests a singular noun which matches the answer.
'political party affected' is the wordplay.
'political party' becomes 'labour' (I've seen this before).
'affected' becomes 'camp' (camp can mean exaggerated or affected).
'labour'+'camp'='LABOUR CAMP'
Can you help me to learn more?
(Other definitions for labour camp that I've seen before include "Place giving convicts hard physical work" , "Penal colony" , "Party adherents" , "Left supporters" , "Penal institution where inmates are forced to work" .)