He's denied freedom to express his political views (8)
I believe the answer is:
internee
'his political views' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he's denied freedom to express' is the wordplay.
'he's denied' becomes 'intern' (I can't justify this - if you can you should believe this answer much more).
'freedom' becomes 'ease' (I've seen this before).
'to express' indicates a 'sounds like' (homophone) clue (I've seen 'expressed' mean this).
'ease' sounds like 'ee'.
'intern'+'ee'='INTERNEE'
Can you help me to learn more?
(Other definitions for internee that I've seen before include "Prisoner of war living in armed camp or prison" , "One imprisoned during wartime" , "Suspect held" , "Imprisoned person" , "One is held without trial" .)