Crossword Genius

Knock style of music (3)

Ross

I believe the answer is:

rap

I believe this is a double definition.

'knock' is the first definition.
('rap' can be a synonym of 'knock')

'style of music' is the second definition.
(I've seen this before)

(Other definitions for rap that I've seen before include "Small amount" , "Criminal charge" , "Urban music style" , "Form of music with chanted rhyming lyrics" , "Sort of music" .)

I've seen this clue in The Mirror.
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