Seeing all but not the top of the cake (5)

I believe the answer is:

icing

I'm a little stuck... Click here to teach me more about this clue!

'top of the cake' is the definition.
'icing' can be an answer for 'top' (I have seen 'Top of cake ' mean 'icing' so perhaps 'top' could also mean 'icing'). I am not sure about the 'of the cake' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for icing that I've seen before include "Formation of frost on aircraft" , "Sugar coating - a danger to aircraft, on roads etc" , "that finishes off 29 [ANGEL CAKE]" , "Sugary topping" , "Topping in a bag" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.