Hip-hop hit (3)
I believe the answer is:
rap
I believe this is a double definition.
'hip-hop' is the first definition.
(I've seen this in another clue)
'hit' is the second definition.
(rap can mean to knock or hit)
(Other definitions for rap that I've seen before include "Pounding" , "Sharply strike; rebuke" , "Administer sharp blow, being below par" , "Music; charge; strike" , "black music is a > blow" .)