Crossword Genius

A drink that leaves one lying on the floor? (8,5)

Ross

I believe the answer is:

knockout punch

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

'a drink that leaves one lying on the floor?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'drink that leaves one lying on the floor?' is the wordplay.
I cannot quite understand how this works, but
'drink' could be 'punch' (punch is an alcoholic drink) and 'punch' is present in the answer.
'one' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'floor?' could be 'ko' (I've seen this in other clues) and 'ko' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Irish News.
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