Opposite of none (3)
I believe the answer is:
all
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">opposite of none</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for all that I've seen before include "without exception" , "Every single one" , "The whole quantity" , "and 18: 'Sing through -- --' (carol)" , "SECOND PART OF 8" .)