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It's goodbye to the Japanese (8)

Ross

I believe the answer is:

sayonara

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'it's goodbye' is the definition.
(Japanese for 'goodbye')

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

Can you help me to learn more?

(Other definitions for sayonara that I've seen before include "Goodbye or farewell in Japan" , "Japanese valediction" , "Goodbye (Jap.)" , "Japanese goodbye" , "Japanese farewell" .)

I've seen this clue in The Irish Independent.
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