Without dividing walls (4-4)
I believe the answer is:
open-plan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">without dividing walls</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 open-plan that I've seen before include "style in office" , "Offices without walls" , "No pen pal in office lay-out without partitions" , "(Of office) having few dividing walls" , "Office without walls" .)