Currently it has two banks in Dublin (6)

I believe the answer is:

liffey

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'dublin' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for liffey that I've seen before include "Dublin river" , "Dublin's river" .)

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

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