A reminder of the late quality of wine (10)
I believe the answer is:
gravestone
This clue could be a double definition.
'a reminder of the late' is the first definition.
(late can mean dead)
'quality of wine' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
(Other definitions for gravestone that I've seen before include "lapidary valediction" , "Churchyard memorial" , "Burial marker" , "superior to body" .)