Crossword Genius

Realises party drink ends in unpleasant fiasco (5,2,2)

Ross

I believe the answer is:

wakes up to

I'm a little stuck... Click here to teach me more about this clue!

'ends in unpleasant fiasco' is the definition.
I know nothing about this answer so I can't tell whether this works.

'realises party drink' is the wordplay.
I cannot really understand how this works, but
'party' could be 'wake' (I've seen this before) and 'wake' is located in the answer.
'drink' could be 'sup' (to sup is to drink) and 'sup' is found within the answer.
The remaining letters 'to' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

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