Large woodwind instrument (7)
I believe the answer is:
bassoon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large woodwind instrument</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bassoon that I've seen before include "Hollow instrument" , "Instrument heard by Wedding-Guest" , "It is played" , "So-so ban over the instrument" , "Double-reed instrument" .)