Crossword Genius

This as basis for the annual blow-out? (8,4)

Ross

I believe the answer is:

birthday cake

I'm a little stuck...
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Here is my best explanation:

'this as basis for the annual blow-out?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

This is the entire clue.

Ross

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This clue was last seen in The Independent

(Other definitions for birthday cake that I've seen before include "Celebratory confection", "Anniversary fare" and "Yearly confection".)

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