Musician playing rap hits (7)
I believe the answer is:
harpist
'musician' is the definition.
(harpist is a kind of musician)
'playing rap hits' is the wordplay.
'playing' indicates an anagram.
'rap'+'hits'='raphits'
'raphits' anagrammed gives 'HARPIST'.
(Other definitions for harpist that I've seen before include "Instrumentalist" , "Stringed instrument player" , "musician" .)