Transfer between banks (5)

I believe the answer is:

ferry

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'transfer between' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ferry that I've seen before include "Regular passenger boat" , "Carry over water" , "Passenger ship travelling regularly over a short distance" , "Boat across e.g. English Channel" , "Boat that provides transport over stretch of water" .)

I've seen this clue in The Globe and Mail, The Guardian and The Telegraph.

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