Not together (5)
I believe the answer is:
apart
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not together</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 apart that I've seen before include "In pieces; separate" , "in isolation" , "away" , "Separated or at a distance" , "Separated physically" .)