Crossword Genius

They run fast and they play dirty, we’re told (8)

Ross

I believe the answer is:

cheetahs

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cheetahs that I've seen before include "Swift, long-legged cats" , "fast runners" , "The aches one gets from big cats" , "Swift spotted cats" , "animals" .)

I've seen this clue in The Times.
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