Not standing (6)
I believe the answer is:
seated
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not standing</span>' is the definition.<br/ ><span class="explanation-format__explanation">('seated' is the opposite to 'standing')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for seated that I've seen before include "Given chair" , "Sedentary" , "Sitting in sedate way" , "not standing for it" .)