Topper (5)

I think it could be either:

Which length description are you looking for?:

icing

'topper' 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 "piece of cake?" , "unwelcome on aircraft" , "that finishes off 29 [ANGEL CAKE]" , "Sweet thing" , "Sweet coating on cake" .)

I've seen this clue in The Guardian.

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