Page layout (6)
I believe the answer is:
format
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">page layout</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 format that I've seen before include "Secure firmly in position" , "Style or arrangement of a TV programme" , "Arrangement or lay-out, say of book" , "Design, lay-out" , "Prepare (a disk) for data" .)