"For goodness' ___!" (4)
'for goodness'' is the definition.
(sake is a kind of goodness)
This is all the clue.
(Other definitions for sake that I've seen before include "Jap. alcoholic drink from rice; for Pete's -" , "Japanese alcoholic drink made from rice" , "Japanese rice wine" , "Japanese rice alcohol" , "For old times' --" .)