This’ll be spicy, let’s wait up (3,3)

I believe the answer is:

won ton

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'wait up' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for won ton that I've seen before include "snack" , "'Chinese dumpling served in soup (3,3)'" .)

I've seen this clue in The Times.

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