Crossword Genius

Knock musical genre (3)

Ross

I believe the answer is:

rap

I believe this is a double definition.

'knock' is the first definition.
(I know that knock can be written as rap)

'musical genre' is the second definition.
(I know that rap is a musical genre)

(Other definitions for rap that I've seen before include "Short quick tap" , "Sharp knock; rebuke" , "Knock loudly" , "Blame, punishment" , "Music; charge; strike" .)

I've seen this clue in The Times.
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