A Chinese craft? What rubbish! (4)

I believe the answer is:

junk

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'rubbish' is the definition.
(I know that junk is a type of rubbish)

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

Can you help me to learn more?

(Other definitions for junk that I've seen before include "Discarded items - Chinese sailing vessel" , "Sailing vessel; rubbish" , "Abandon" , "Accumulated rubbish" , "ship" .)

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

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