Exploitative person (4)
I believe the answer is:
user
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exploitative person</span>' is the definition.<br/ ><span class="explanation-format__explanation">(someone who uses others)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for user that I've seen before include "Ruse for employer" , "Drug addict (informal)" , "Person who takes drugs" , "Exploiter (of others)" , "Ruse (anag.)" .)