One withdraws before the wine is served (6,6)
I believe the answer is:
bottle opener
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for bottle opener that I've seen before include "one could get cap knocked off!" , "Kitchen utensil" , "Device removing drink caps" , "Prising implement" , "Cap remover" .)