Delivered to an enemy by treachery (8)
I believe the answer is:
betrayed
'delivered to an enemy by treachery' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for betrayed that I've seen before include "Double-crossed, was disloyal" , "What Jesus was by Judas Iscariot" , "Double-crossed, abandoned" , "Was disloyal, assisted enemy" , "Denounced" .)