Crossword Genius

Jersey police officer's instruction to motorist? (8)

Ross

I believe the answer is:

pullover

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'jersey' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for pullover that I've seen before include "Go to side of road" , "Knitted garment" , "Sweater or jumper" , "Jersey" , "Woolly" .)

I've seen this clue in The Telegraph.
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