No-show (8)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">no-show</span>' is the definition.<br/ ><span class="explanation-format__explanation">(person who has not shown up for something)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for absentee that I've seen before include "to prompt a hearty increase in affection!" , "one's failed to show up" , "Someone not present" , "One who stays away" , "One is not present when required" .)