Air-powered instruments (6)
I believe the answer is:
organs
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">air-powered instruments</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 organs that I've seen before include "Groans over distinct parts of animal body" , "Periodicals published by special interest groups" , "Heart and lungs are vital ones" , "Large wind instruments with keyboards" , "Functional units in the body" .)