Some empty cage largely reflecting what's left after death (6)
I believe the answer is:
legacy
'what's left after death' is the definition.
(a legacy is left to one's heirs)
'some empty cage largely reflecting' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'reflecting' shows that the letters should be reversed in order.
'ycagel' is hidden in the letters of 'empty cage largely'.
'ycagel' back-to-front is 'LEGACY'.
(Other definitions for legacy that I've seen before include "Something handed down" , "It's passed on" , "What's left" , "Heritage" , "Birthright" .)