Crossword Genius

City without borders beginning to weary mean residents (7)

Ross

I believe the answer is:

swansea

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'city' is the definition.
(Swansea is an example)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for swansea that I've seen before include "South Wales city" , "Ecstasy, a win! (anag)" , "Welsh port" , "South Wales port" , "Welsh city" .)

I've seen this clue in The Daily Express.
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