Get a hundred advanced by deceit (3)

I believe the answer is:

con

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'deceit' is the definition.
(thesaurus)

'get a hundred advanced' is the wordplay.
'get' means one lot of letters go next to another.
'a hundred' becomes 'C' (Roman numeral).
'advanced' becomes 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
'c' put next to 'on' is 'CON'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for con that I've seen before include "Deceive; convict (colloq.)" , "Diddle" , "Rook" , "Swindle or trick someone" , "Not in favour" .)

I've seen this clue in the Evening Standard.

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