Sends information over -- is lacking jargon (5)

I believe the answer is:

slang

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'jargon' is the definition.
(I know that jargon can be written as slang)

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

Can you help me to learn more?

(Other definitions for slang that I've seen before include "Informal language used by a set of people" , "See 15" , "Berate" , "Insult" , "Informal speech" .)

I've seen this clue in The Telegraph.

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