One not present (8)
I believe the answer is:
absentee
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one not present</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for absentee that I've seen before include "One is not present when required" , "One away from work, etc" , "one's failed to show up" , "One who stays away" , "to prompt a hearty increase in affection!" .)