Spectre, phantom (6)
I believe the answer is:
spirit
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">spectre</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">phantom</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for spirit that I've seen before include "essence" , "Courage, energy" , "Distilled alcoholic drink" , "Short" , "The sort of drink" .)