Refuse cataloguing system for books (4)
I believe the answer is:
marc
'refuse' is the definition.
(discarded material in winemaking)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for marc that I've seen before include "Drink" , "Brandy made from wine press residue" , "Type of brandy" , "Refuse from grapes after pressing - kind of brandy" , "Type of eau-de-vie made from residue of grapes" .)