Crossword Genius

As musical entertainment, one might knock it (3)

Ross

I believe the answer is:

rap

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'as musical' 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 can't see?

I don't understand the rest of the clue.

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(Other definitions for rap that I've seen before include "African-American music in which the lyrics are spoken" , "Smack (knuckles)" , "Knock sharply" , "Administer sharp blow, being below par" , "Sharp blow; criticism" .)

I've seen this clue in the Evening Standard.
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