Prisoner punished and locked up (8)
I believe the answer is:
confined
'locked up' is the definition.
(I've seen this before)
'prisoner punished' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'punished' becomes 'fined' (similar in meaning).
'con'+'fined'='CONFINED'
'and' is the link.
(Other definitions for confined that I've seen before include "Not free to move about" , "Enclosed, cramped" , "Kept within limits" , "Restricted" , "put inside" .)