Crossword Genius

Setbacks during the spells of batting? (6)

Ross

I believe the answer is:

knocks

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'setbacks' is the definition.
The answer and definition can be both related to natural events as well as being plural nouns.
Maybe there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for knocks that I've seen before include "Gentle taps" , "Strikes with a sharp blow or finds fault with" , "Raps on the door" , "You get bad experiences in the school of hard ..." , "Hits" .)

I've seen this clue in the Evening Standard.
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