Where deposits build up both sides of the Nile, say (5)

I believe the answer is:

banks

I believe this is a double definition.

'where deposits build up' is the first definition.
(deposits may build up in a bank account)

'both sides of the nile say' is the second definition.
(riverbanks)

(Other definitions for banks that I've seen before include "Financial institutions" , "Relies" .)

I've seen this clue in The Telegraph.

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