Crossword Genius

Unknown boy hero on top in China (7)

Ross

I believe the answer is:

pottery

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'china' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for pottery that I've seen before include "Ceramics factory" , "Ceramic ware" , "Earthenware" , "Items made from clay" , "Clayware" .)

I've seen this clue in The Hindu.
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