Icy dessert (6)
I believe the answer is:
sorbet
'icy dessert' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sorbet that I've seen before include "Sherbet, water-ice" , "Fruit water-ice" , "Mushy ice drink to cleanse the palate" , "Refresher course" , "Water ice to cleanse the palate" .)