Instrument with a conical bore (4)
I believe the answer is:
oboe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">instrument with a conical bore</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oboe that I've seen before include "Musical instrument" , "Double-reeded woodwind instrument" , "Double-reed woodwind" , "Source of music" , "Player" .)