Stone; music genre (4)
I believe the answer is:
rock
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">stone</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that stone can be written as rock)</span><br/ ><br/ >'<span class="explanation-format__original">music genre</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that rock is a type of popular music)</span><br/ ><br/ ></span>
(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" .)