Swell financier in case of enquiry for charlatanism (13)

I believe the answer is:

mountebankery

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'charlatanism' is the definition.
(I know that charlatanism can be written as mountebankery)

'swell financier in case of enquiry' is the wordplay.
'swell' becomes 'mount' (I can't explain this - if you can you should believe this answer much more).
'financier' becomes 'banker' (banker is a kind of financier).
'in' is an insertion indicator.
'case of' means to remove the middle letters (like emptying a case).
'enquiry' with its middle taken out is 'ey'.
'banker' placed within 'ey' is 'ebankery'.
'mount'+'ebankery'='MOUNTEBANKERY'

'for' is the link.

Can you help me to learn more?

(Another definition for mountebankery that I've seen is " Quackery".)

I've seen this clue in The Times.

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