Crossword Genius

Chinese take-away? (8)

Ross

I believe the answer is:

shanghai

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'chinese' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for shanghai that I've seen before include "part of China?" , "Trick into naval service" , "Oddly, you can gain hash in the Chinese city" , "Trick (someone) into becoming a sailor" , "Drug and put on a ship" .)

I've seen this clue in The Sun.
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