Break out of confinement (6)
I believe the answer is:
escape
'break out of confinement' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for escape that I've seen before include "Evade" , "Get free from captivity" , "Get away from depravity" , "Get out of captivity, go over the wall" , "Break free from confinement" .)