Crossword Genius

New York squad turning up to make arrest (4)

Ross

I believe the answer is:

stem

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'arrest' is the definition.
(both can mean to stop)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for stem that I've seen before include "part of a ship" , "Staunch - stalk" , "Stop the flow of, check" , "Stop or slow the flow of" , "Dam" .)

I've seen this clue in The Guardian.
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