Prefix for "binary" (3)
I believe the answer is:
non
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prefix for binary</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 non that I've seen before include "Negative French word" , "Prefix meaning negative" , "- - -stick" , "Prefix meaning not or none" , "Prefixed negation of a word" .)