To the other side (6)
I believe the answer is:
across
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">to the other side</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 across that I've seen before include "Horizontally" , "Facing" , "As this is entered" , "Clues like this" , "sort of clue?" .)