Frozen treat (3,5)
(Other definitions for ice cream that I've seen before include "Frozen desert" , "chilling creation" , "Sweet frozen foodstuff" , "Frozen food made with milk fat" , "99, for example" .)
'frozen treat' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ice lolly that I've seen before include "It's frozen on a small wooden stick" , "'Frozen sweet on a stick (3,5)'" , "cold sweet" , "summer treat" , "Something to be licked on a stick" .)