Kettle drums (7)
I believe the answer is:
timpani
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kettle drums</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 timpani that I've seen before include "Mini tap on a large drum" , "Those beaten" , "Percussion section" , "PM, I ain't (anag.)" , "orchestra members" .)