Crossword Genius

Reportedly I spill the beans on the cake? (5)

Ross

I believe the answer is:

icing

'on the cake?' is the definition.

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

(Other definitions for icing that I've seen before include "Decorative cake coating" , "piece of cake?" , "Decorating (a cake)" , "Cake topper" , "Food coating" .)

I've seen this clue in The Guardian.
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