One opens sack? (9)
I believe the answer is:
corkscrew
'one opens sack?' is the definition.
(sack is a type of wine)
This is all the clue.
(Other definitions for corkscrew that I've seen before include "This might help one who gets in the drink" , "Spiral device for wine lovers" , "Graves opened by this" , "convoluted course" , "Device used to get at red" .)