Bum died in prison cell (5)
I believe the answer is:
'bum' is the definition.
(I've seen this before)
'died in prison cell' is the wordplay.
'died' becomes 'd'.
'in' means one lot of letters goes inside another.
'prison cell' becomes 'cage'.
'd' going inside 'cage' is 'CADGE'.
(Other definitions for cadge that I've seen before include "Caged (anag.)" , "Sponge (money, etc)" , "Get by begging" , "Scrounge (money, etc)" , "Scrounge, sponge" .)