Crossword Genius

Add one's name to an advert? (4)

Ross

I believe the answer is:

sign

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'an advert?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'add one's name' is the wordplay.
'add one's' becomes 'sig' (I am not sure about this - if you are sure you should believe this answer much more).
'name' becomes 'n' (common abbreviation e.g. on forms).
'sig'+'n'='SIGN'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for sign that I've seen before include "Indication - put one's name down" , "Omen or indication" , "Communicate to the deaf" , "Put one's name to a document" , "Ram" .)

I've seen this clue in the Evening Standard.
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