Hip-hop features singular harsh noise (4)
I believe the answer is:
rasp
'harsh noise' is the definition.
(I've seen this in another clue)
'hip-hop features singular' is the wordplay.
'hip-hop' becomes 'rap' (I've seen this in another clue).
'features' means one lot of letters goes inside another.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'rap' enclosing 's' is 'RASP'.
(Other definitions for rasp that I've seen before include "Harsh noise - file" , "Coarse file or grating sound" , "It is used to grate" , "fruit" , "sort of berry?" .)