Tormentor (6)
(Other definitions for abuser that I've seen before include "one who uses bad language" , "Person who over-indulges in, say, drugs or drink" , "He takes undue advantage" , "One mistreating another" , "One who reviles or a misuser of drugs" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tormentor</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that tormentor can be written as teaser)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for teaser that I've seen before include "Tricky question; intriguing preliminary advert" , "Difficult problem concerning Easter" , "Introduction to arouse curiosity" , "Tricky question; intriguing ad" , "Puzzling question or gentle goader" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tormentor</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sadist that I've seen before include "An amalgam, made up of two or more parts" , "One who takes pleasure in cruelty" , "One who enjoys cruelty" , "Tormentor" , "One who delights in cruelty" .)