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Essentially get kid to order some drinks -- and down nine? (4,3,3,4)

Ross

I believe the answer is:

have one too many

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'essentially' is the definition.
I know nothing about this answer so I can't tell whether this works.

'kid to order some drinks and down nine?' is the wordplay.
I cannot really see how this works, but
'kid' could be 'haveon' (I've seen this before) and 'haveon' is located in the answer.
'to' is present in the answer.
'order' could be 'om' (order of merit) and 'om' is found within the answer.
'some' could be 'any' (similar in meaning) and 'any' is found within the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'get' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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