Death - with 50% of fish, it’s a fruit stone (8)

'a fruit stone' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'death with 50% of fish' is the wordplay.
I cannot really see how this works, but
'death' could be 'end' (synonyms) and 'end' is present in the answer.
'of' could be 'o' and 'o' is present in the answer.
'fish' could be 'carp' (carp is a kind of fish) and 'carp' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'it's' is the link.

Can you help me to learn more?