Illness identification (9)
I believe the answer is:
diagnosis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">illness identification</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 diagnosis that I've seen before include "Identification of a problem from its symptoms" , "doctor's opinion" , "analysis" , "Interpretation of" , "Doctor's verdict" .)