Rhythmic performer, one preparing for Christmas broadcast? (6)

I believe the answer is:

rapper

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'rhythmic performer' is the definition.
'rapper' can be an answer for 'performer' (I've seen this before). I am not sure about the 'rhythmic' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rapper that I've seen before include "Modern musician" , "Rhyming singer" , "Eg, Eminem" , "One who knocks" , "Singer, sounds like covering" .)

I've seen this clue in The Guardian.

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