Alone, without company (8)
I believe the answer is:
solitary
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">alone</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">without company</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for solitary that I've seen before include "Without company" , "Being the only one" , "Alone, single" , "Confinement" , "Lone; isolated" .)