Chills (4)
I believe the answer is:
ices
'chills' is the definition.
(icing is a kind of chilling)
This is all the clue.
(Other definitions for ices that I've seen before include "Kills (slang) - sweets" , "Decorates cakes with frosting" , "Cones etc" , "summer refreshment" , "Decorates cake with sugar topping" .)