Refuse short, brisk walk (4)
I believe the answer is:
marc
'refuse' is the definition.
(discarded material in winemaking)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for marc that I've seen before include "A brandy; --- Chagall, artist" , "Brandy made from wine press residue" , "Strong liquor" , "Cram (anag.)" , "Refuse from grapes after pressing - kind of brandy" .)