Where one's funeral rites are performed? Not on your life! (4,2,4,4)
I believe the answer is:
over my dead body
'where one's funeral rites are performed? not' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'on your life' is the wordplay.
I cannot really understand how this works, but
'on' could be 'over' (I've seen this in other clues) and 'over' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for over my dead body that I've seen before include "not if I have any say" , "Where my last outfit will go" , "should one grieve here?" , "Where earth may be scattered" , "Not if I can help it!" .)