Consider prisoner joining model (11)
I believe the answer is:
contemplate
'consider' is the definition.
(I know that contemplate is a more specific form of the action consider)
'prisoner joining model' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'joining' means one lot of letters go next to another.
'model' becomes 'template' (template is a kind of model).
'con'+'template'='CONTEMPLATE'
(Other definitions for contemplate that I've seen before include "Look at thoughtfully" , "Consider" , "Ruminate on" , "Think seriously" , "Ponder" .)