Musical ability (3)
I believe the answer is:
ear
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">musical ability</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 ear that I've seen before include "Shell-like (slang)" , "Organ involved with balance" , "Heed" , "Musical appreciation" , "Place for a plug" .)