Where US criminals are ready for release (2,3,3)
I believe the answer is:
in the can
'ready for release' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for in the can that I've seen before include "ready for release" , "Jailed" , "Imprisoned in America" , "ready to be released" , "(Of a film or piece of music) satisfactorily recorded, etc" .)