Bum died in prison (5)
I believe the answer is:
cadge
'bum' is the definition.
(both can mean to beg someone for something)
'died in prison' is the wordplay.
'died' becomes 'd'.
'in' means one lot of letters goes inside another.
'prison' becomes 'cage' (I've seen this before).
'd' put within 'cage' is 'CADGE'.
(Other definitions for cadge that I've seen before include "Go about begging, scrounge" , "freeload" , "Get by begging" , "beg" , "Caged (anag.)" .)