Omitting small line carving cake decoration (5)

I believe the answer is:

icing

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'cake decoration' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for icing that I've seen before include "Deposit" , "it's dangerous on the roads" , "Food coating" , "Sugar coating as cake decoration" , "Sugar coating - a danger to aircraft, on roads etc" .)

I've seen this clue in The Telegraph.

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