Partition or divider (6)
I believe the answer is:
screen
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">partition</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that screen is a type of partition)</span><br/ ><br/ >'<span class="explanation-format__original">divider</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that screen is a type of divider)</span><br/ ><br/ ></span>
(Other definitions for screen that I've seen before include "Divider to select for suitability." , "Shield - broadcast" , "Surface for projection of pictures" , "show on TV" , "Examine carefully to select or eliminate" .)