Remove hydrogen from milk drink to make wine (4)
I believe the answer is:
sake
'wine' is the definition.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for sake that I've seen before include "Japanese alcoholic drink made from rice" , "Benefit - Japanese drink" , "Benefit - Japanese liquor" , "Japanese rice wine" , "account" .)