Drug for treatment (8)
I believe the answer is:
medicine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drug for treatment</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 medicine that I've seen before include "Drug for treatment" , "Study of diseases and cures" , "Mice dine (anag.)" , "Treatment for illness" , "Curative treatment" .)