Crossword Genius

Nothing hit the ground? (4)

Ross

I believe the answer is:

duck

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

'nothing' is the definition.
(duck means zero in cricket)

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

Can you help me to learn more?

(Other definitions for duck that I've seen before include "Shoveler, for example" , "Evade - bird" , "poor score?" , "Steer clear" , "Waterbird" .)

I've seen this clue in The Irish Times.
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