Communication in bits (5)

I believe the answer is:

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'communication' is the definition.
(I know that email is a type of electronic communication)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for email that I've seen before include "Messages between computer terminals" , "Messages via the internet" , "Message sent via computer" , "Electronic message" , "Digital message" .)

I've seen this clue in The Guardian.

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