Crossword Genius

They take the lead in arrests (7)

Ross

I believe the answer is:

collars

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'arrests' is the definition.
(I know this)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for collars that I've seen before include "Ties with them, perhaps" , "Grasps" .)

I've seen this clue in The Sun.
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