Bring down alcoholic drink with leaders swapping places in business meal (5,5)

I believe the answer is:

power lunch

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'bring down alcoholic drink with leaders swapping places' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'business meal' is the wordplay.
'business' becomes 'power' (I can't explain this - if you can you should give a lot more credence to this answer).
'meal' becomes 'lunch' (lunch is a kind of meal).
'power'+'lunch'='POWER LUNCH'

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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