What malingerer has picked up that's in his cellar? (9)
I believe the answer is:
champagne
'what malingerer has picked up that's in his cellar?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
This is the entire clue.
Can you help me to learn more?
(Other definitions for champagne that I've seen before include "part of France" , "the stuff of success?" , "Fizz" , "Fizzy drink" , "bubbles" .)