How much money the VIP has? (8)

I believe the answer is:

sixpence

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'how much money the vip has?' is the definition.
I can't tell whether this defines the answer.

'how much money' is the wordplay.
'how much' becomes 'six' (I can't explain this - if you can you should give a lot more credence to this answer).
'money' becomes 'pence' (I've seen this before).
'six'+'pence'='SIXPENCE'

Can you help me to learn more?

(Other definitions for sixpence that I've seen before include "Old tanner" , "Former coin, one fortieth of a pound" , "Old British coin" , "'Tanner' (coin)" , "bit dated" .)

I've seen this clue in the Evening Standard.

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