Protecting millions in online financial sector (9)

I believe the answer is:

embanking

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'protecting' is the definition.
Both the answer and definition are present participle verbs.
Perhaps they are linked in a way I don't understand?

'millions in online financial sector' is the wordplay.
'millions' becomes 'm' (abbreviation).
'in' indicates putting letters inside.
'online financial sector' becomes 'ebanking' (I can't explain this - if you can you should believe this answer much more).
'm' inserted into 'ebanking' is 'EMBANKING'.

Can you help me to learn more?

I've seen this clue in The Times.

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