Crossword Genius

Did the Romans figure it as the capital of China? (7)

Ross

I believe the answer is:

hundred

I'm a little stuck... Click here to teach me more about this clue!

'capital of china?' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hundred that I've seen before include "Subdivision of shire; ton" , "Former division of county" , "entirely associated with 27 [PERCENT]" , "See 19" , "Old part of county" .)

I've seen this clue in the Evening Standard.
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