Crossword Genius

Bank's retainer? (7)

Ross

I believe the answer is:

deposit

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

This could be a double definition.

'bank's' is the first definition.
(I've seen this before)

'retainer?' is the second definition.
The definition and answer can be both related to property as well as being singular nouns.
Maybe there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for deposit that I've seen before include "Precipitate" , "Money up front" , "(Money or mineral) put down" , "part-payment" , "Set down" .)

I've seen this clue in The Telegraph.
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