26 across
Heartless
bum
in
prison
(4)
Heartless bum in prison (4)
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The definition is at the end of the clue.
How the clue works
Take "CADGE", meaning to bum or beg, and knock out its middle letter (that's the "heartless" bit) to leave you with the answer. Prison at the end is your definition, since a cage can serve as one.