Cake cover (5)
I believe the answer is:
icing
'cake cover' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for icing that I've seen before include "Sugary topping" , "Food coating" , "You could see this on a cake" , "it's dangerous on the roads" , "Topping in a bag" .)