Drunk lies with wife, getting to sleep having cocktail (7)

I believe the answer is:

swizzle

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But I can't explain it at all! Could you help me understand?

(Other definitions for swizzle that I've seen before include "It's used to take the fizz out of drinks" , "Fraud" , "Mixed alcoholic drink" , "great disappointment" .)

I've seen this clue in The Hindu.

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