Judge to employ prison - not cold - for disobedient person (9)
I believe the answer is:
refusenik
'not cold for disobedient person' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'judge to employ prison' is the wordplay.
'judge' becomes 'ref' (referee).
'to employ' becomes 'use' ('use' can be a synonym of 'employ').
'prison' becomes 'nik' (I am not sure about this - if you are sure you should believe this answer much more).
'ref'+'use'+'nik'='REFUSENIK'
Can you help me to learn more?
(Other definitions for refusenik that I've seen before include "Protester" , "Soviet dissident" , "who refuses to cooperate" .)