Crossword Genius

Useless vessel? (4)

Ross

I believe the answer is:

junk

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'vessel?' is the definition.
(type of Asian ship)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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