Claim from prisoner seen by nurse (7)
I believe the answer is:
contend
'claim' is the definition.
(synonyms)
'prisoner seen by nurse' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'seen by' is a charade indicator (letters next to each other).
'nurse' becomes 'tend' (I've seen this before).
'con'+'tend'='CONTEND'
'from' acts as a link.
(Other definitions for contend that I've seen before include "Struggle; assert" , "Struggle in rivalry" , "Tend NCO (anag.)" , "Maintain" , "Struggle (with someone)" .)