Nothing hit the ground? (4)
I believe the answer is:
duck
'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" .)