Disorient prisoner having to integrate (7)
I believe the answer is:
confuse
'disorient' is the definition.
(thesaurus)
'prisoner having to integrate' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'having' means one lot of letters go next to another.
'to integrate' becomes 'fuse' (I've seen this before).
'con'+'fuse'='CONFUSE'
(Other definitions for confuse that I've seen before include "Muddle, mix up" , "Disconcert, befuddle" , "Perplex" , "Puzzle" , "Bewilder" .)