Crossword Genius

Wherein to keep money on the side (4)

Ross

I believe the answer is:

bank

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'wherein to keep money' is the first definition.
I know that 'money' relates to this answer.

'the side' is the second definition.
(bank is a kind of side)

'on' acts as a link.

Can you help me to learn more?

(Other definitions for bank that I've seen before include "Reserve" , "Row" , "area by river" , "Count" , "deposit" .)

I've seen this clue in the Evening Standard.
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