Guide to China's ancient city (7)

I believe the answer is:

antioch

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

'ancient city' is the definition.
(I've seen this before)

'guide to china's' is the wordplay.
'to china' anagrams to 'ANTIOCH'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for antioch that I've seen before include "Ancient city now Antakya" , "Place for early Christians" , "Ancient Syria capital" , "early Christian centre" , "Early centre of Christianity" .)

I've seen this clue in The Guardian.

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