Is it pulled to preserve neck of jumper? (7)
I believe the answer is:
ripcord
'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" .)