Crossword Genius

Noah's upgrade to US city? (6)

Ross

I believe the answer is:

newark

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'city?' is the definition.
(Newark is an example)

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

Can you help me to learn more?

(Other definitions for newark that I've seen before include "Town on river Trent where King John died" , "east coast port" , "US port" , "Notts. town; NJ city" , "24 Down in Nottinghamshire" .)

I've seen this clue in the Sydney Morning Herald.
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