Happy prisoner with outdoor accommodation (7)
I believe the answer is:
content
'happy' is the definition.
(associated in meaning)
'prisoner with outdoor accommodation' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'with' says to put letters next to each other.
'outdoor accommodation' becomes 'tent' (I've seen this in another clue).
'con'+'tent'='CONTENT'
(Other definitions for content that I've seen before include "Peacefully happy" , "Satisfied; volume" , "Elements" , "state of peaceful happiness" , "Gist" .)