Restricted prisoner given penalty (8)
I believe the answer is:
confined
'restricted' is the definition.
('confine' can be a synonym of 'restrict')
'prisoner given penalty' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'given penalty' becomes 'fined' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'con'+'fined'='CONFINED'
Can you help me to learn more?
(Other definitions for confined that I've seen before include "Imprisoned or limited in space" , "Restricted" , "locked up" , "Kept within limits" , "deprived of freedom" .)