Crossword Genius

Is it pulled to preserve neck of jumper? (7)

Ross

I believe the answer is:

ripcord

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'jumper?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

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

Can you help me to learn more?

(Other definitions for ripcord that I've seen before include "It's pulled to open a parachute" , "Release for parachute" .)

I've seen this clue in The Independent.
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