Prisoner given shelter is satisfied (7)
I believe the answer is:
content
'is satisfied' is the definition.
(similar in meaning)
'prisoner given shelter' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'given' is a charade indicator (letters next to each other).
'shelter' becomes 'tent' (tent is a kind of shelter).
'con'+'tent'='CONTENT'
(Other definitions for content that I've seen before include "Satisfied - all within - capacity" , "Elements" , "Satisfied, happy enough" , "Satisfied - subject matter" , "substance of book?" .)