Crossword Genius

Dash perhaps part of GP's email address? (4)

Ross

I believe the answer is:

sign

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This clue is a quadruple definition!!

'dash perhaps' is the first definition.
(dash is a kind of sign)

'part' is the second definition.
(sign is a kind of part)

'of' acts as a link.

'gp's email' is the third definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?

'address?' is the fourth definition.
(address is a kind of sign)

Can you help me to learn more?

(Other definitions for sign that I've seen before include "Mark" , "Communicate silently" , "As the star was for 14 across" , "Omen or indication" , "Public notice; gesture" .)

I've seen this clue in The Telegraph.
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