Stone; music genre (4)
I believe the answer is:
rock
This clue is a double definition.
'stone' is the first definition.
(I know that stone can be written as rock)
'music genre' is the second definition.
(I know that rock is a type of popular music)
(Other definitions for rock that I've seen before include "Hard stone or lively music" , "Brighton sweet?" , "Gently move; boulder" , "Swing" , "possible danger at sea" .)