Gate or fence (7)
I believe the answer is:
barrier
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">gate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that barrier is a type of gate)</span><br/ ><br/ >'<span class="explanation-format__original">fence</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for barrier that I've seen before include "Boom" , "Thing preventing passage or access" , "Obstacle to progress" , "'Blockade, fence (7)'" , "Structure preventing access" .)