The enrichment of Tokay, say, is more fine over time (5,3)
I believe the answer is:
noble rot
'the enrichment of tokay say' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'more fine over time' is the wordplay.
'more fine' becomes 'nobler' (I can't justify this - if you can you should believe this answer much more).
'over' becomes 'o' (cricket abbreviation).
'time' becomes 't' (abbreviation).
'nobler'+'o'+'t'='NOBLE ROT'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for noble rot that I've seen before include "Mould on grapes used for certain wines" , "Grape-shrivelling mould" , "Mould on wine grapes" , "Mould that beneficially affects grapes" , "Mould useful in making some wines" .)