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Where US criminals are ready for release (2,3,3)

Ross

I believe the answer is:

in the can

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'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" .)

I've seen this clue in The Telegraph.
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