Wasted evening? (5-2)

I believe the answer is:

booze-up

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'wasted evening?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for booze-up that I've seen before include "Drinking spree" , "Bout of serious drinking" , "Heavy drinking session" .)

I've seen this clue in The Sun.

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