Broker’s request possibly to ruin liquor buzz (6,4)

I believe the answer is:

margin call

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'broker's request' is the definition.
'margin call' can be an answer for 'request' (margin call is a kind of request). I am not certain of the 'broker's' bit.

'to ruin liquor buzz' is the wordplay.
'to ruin' becomes 'mar' (I've seen this in another clue).
'liquor' becomes 'gin' (gin is a kind of liquor).
'buzz' becomes 'call' (I am not sure about this - if you are sure you should believe this answer much more).
'mar'+'gin'+'call'='MARGIN CALL'

'possibly' is the link.

Can you help me to learn more?

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

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