Having a key, in music (5)
I believe the answer is:
tonal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">having a key in music</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tonal that I've seen before include "Relating to music using conventional harmony" , "Relating to conventional keys and harmonies" , "According to musical key" , "Written in conventional keys and harmony" , "of sound quality" .)