Strikingly rhythmic performer? (6)

I believe the answer is:

rapper

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'performer?' is the definition.
(someone who raps)

I don't understand the remainder of the clue.

(Other definitions for rapper that I've seen before include "Singer, sounds like covering" , "Eg, Eminem" , "entertainer who recites to rock music" , "One who knocks" , "Knocker; singer" .)

I've seen this clue in the Evening Standard.

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