Throughout (6)
(Other definitions for across that I've seen before include "Clue with solution not going in the direction of this one!" , "...this is 'Number Ten'" , "Transverse" , "Facing" , "ax" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">throughout</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for during that I've seen before include "Throughout the time of" , "Concurrently" , "Throughout or at a point in the continuance of" , "In the course of" .)