Purgative, emetic (5)
I believe the answer is:
enema
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">purgative</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">emetic</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for enema that I've seen before include "Medical liquid introduced anally" , "In the end medical procedure" , "Liquid injection given as a laxative" , "Colonic irrigation" , "Fluid injected rectally" .)