Convict (8)
'convict' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for prisoner that I've seen before include "Condemned" , "One inside" , "One in gaol" , "One kept confined" , "Person held captive as by law" .)
'convict' is the definition.
(prisoner serving a life sentence)
This is all the clue.
(Other definitions for lifer that I've seen before include "Con" , "person given sizeable bird" , "Long-term prisoner" , "One with very long sentence" , "Serious criminal" .)