Fermented rice beverage (4)
I believe the answer is:
'fermented rice beverage' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sake that I've seen before include "Benefit - behalf" , "Rice drink - for heaven's ____ !" , "A cause" , "Japanese alcoholic drink made from rice" , "For old times' --" .)