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Additional benefit of making dessert? (5,2,3,4)

Ross

I believe the answer is:

icing on the cake

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If this is the answer I cannot explain how the clue works.

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(Other definitions for icing on the cake that I've seen before include "Decorator's work" , "unexpected bonus" , "that may include a sweet celebratory message?" .)

I've seen this clue in the Sydney Morning Herald.
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