Ice cream drink (4)
I believe the answer is:
malt
'ice cream drink' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for malt that I've seen before include "Kind of Scotch whisky" , "Brewing agent" , "Pre-soaked kiln-dried cereal grain" , "Brewing material" , "Germinated and kiln-dried grain used in brewing and distilling" .)