Crossword Genius

Duck from down under about to be introduced to west (4)

Ross

I believe the answer is:

zero

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'duck' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for zero that I've seen before include "Nada" , "You'll find nothing" , "Loser" , "The hour to leave" , "has no effect, in addition" .)

I've seen this clue in The Guardian.
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