Riverside business establishment? (4)

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.

'riverside' is the first definition.
(I've seen this in another clue)

'business establishment?' is the second definition.
'bank' can be an answer for 'establishment?' (bank is a kind of establishment). I am unsure of the 'business' bit.

Can you help me to learn more?

(Other definitions for bank that I've seen before include "Financial establishment" , "Reserve" , "area by river" , "Count" , "6D 5A [TUBE STATION]" .)

I've seen this clue in the Evening Standard.

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