Crossword Genius

Being edgy or touchy, it makes rugby players jump! (4-3)

Ross

I believe the answer is:

line-out

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'jump' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for line-out that I've seen before include "RU throw-in" , "A rugby formation to receive throw-in" , "Outline for a rugby formation" , "Rugby re-start" , "Method of restarting play in rugby" .)

I've seen this clue in the Evening Standard.
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