Escort to dungeon, perhaps, for final confrontation (8)
I believe the answer is:
showdown
'for final confrontation' is the definition.
(I've seen this before)
'escort to dungeon' is the wordplay.
'escort' becomes 'show' (I've seen this in other clues).
'to dungeon' becomes 'down' (I can't explain this - if you can you should give a lot more credence to this answer).
'show'+'down'='SHOWDOWN'
'perhaps' is the link.
(Other definitions for showdown that I've seen before include "Dramatic conclusion" , "Final confrontation as in western film" , "Face-off" , "Climactic finale" , "Decisive confrontation" .)