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Sportsmen may shoot them for fun (6)

Ross

I believe the answer is:

rapids

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'sportsmen' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

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

Can you help me to learn more?

(Other definitions for rapids that I've seen before include "Fast-flowing river section" , "Parts of a river where the current is very fast" , "Where rivers run fast" , "Current hazard" , "Fast river flows, white waters" .)

I've seen this clue in The Globe and Mail.
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