Hip-hop songs (4)
I believe the answer is:
raps
'hip-hop songs' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for raps that I've seen before include "'Knocks, on the door say (4)'" , "Cracks" , "Knocks sharply" , "Sprechgesang pop hits" .)