Crossword Genius

Part of New York known for its rude and noisy cheerfulness (3,5)

Ross

I believe the answer is:

the bronx

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'part of new york' is the definition.
('The Bronx' is part of 'new york')

I cannot understand how the remainder of the clue works.

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(Other definitions for the bronx that I've seen before include "NY borough" , "Mainland borough" .)

I've seen this clue in the Evening Standard.
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