Instrumentality (6)
I believe the answer is:
agency
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">instrumentality</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for agency that I've seen before include "Means - business" , "Business that conducts business on behalf of others" , "Office or business of one who does business for others" , "Organisation providing a particular service" , "Cagney (anag.)" .)