Sold from the cask (7)
I believe the answer is:
draught
'sold from the cask' is the definition.
(as in draught beer)
This is all the clue.
(Other definitions for draught that I've seen before include "One may make you cold" , "Current - drink - drawing - checker" , "Water depth; served from a cask" , "(Of beer) sold from the cask" , "Alcohol drawn from a keg" .)