Crossword Genius

A notedly low price (4)

Ross

I believe the answer is:

song

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'price' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for song that I've seen before include "Lied" , "See 9" , "Tune" , "Vocal item" , "Piece of music, usually with words" .)

I've seen this clue in the Evening Standard.
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