Observation for prisoner in revival (14)
I believe the answer is:
reconnaissance
'observation' is the definition.
(I have seen 'Military observation ' mean 'reconnaissance' so perhaps 'observation' could also mean 'reconnaissance')
'prisoner in revival' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'in' is an insertion indicator.
'revival' becomes 'renaissance' (renaissance is a kind of revival).
'con' placed inside 'renaissance' is 'RECONNAISSANCE'.
'for' is the link.
(Other definitions for reconnaissance that I've seen before include "Military observation" , "Preliminary survey" , "Initial survey" , "Scouting" .)