Beer container in prison (3)
I believe the answer is:
This clue is a double definition.
'beer container' is the first definition.
(I've seen this in another clue)
'prison' is the second definition.
(the can is American slang for prison)
'in' is the link.
(Other definitions for can that I've seen before include "Possesses ability" , "let go in the US" , "has power" , "Vessel" , "sack from abroad" .)