Coroner's investigation (7)
I believe the answer is:
inquest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">coroner's investigation</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 inquest that I've seen before include "Coroner's investigation" , "Coroner's inquiry into cause of death" , "Coroner's jury" , "Coroner's court" , "Post-mortem investigation" .)