It's rhythmic and may be beaten (3)

I believe the answer is:

rap

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I'm afraid I can't explain this answer.

(Other definitions for rap that I've seen before include "African-American music in which the lyrics are spoken" , "Sharply strike; rebuke" , "Censure" , "Smack (knuckles)" , "Sort of music" .)

I've seen this clue in the Evening Standard.

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