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Opening for visitor at last not initially residing in Berlin (6)

Ross

I believe the answer is:

irving

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'berlin' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for irving that I've seen before include "- - Berlin, songwriter" , "-- Berlin, US composer" , "Famous actor" , "Sir Henry --, English actor" , "Sir Henry ---, actor; Washington ---, author" .)

I've seen this clue in The Guardian.
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