Obstacles (8)
I believe the answer is:
barriers
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">obstacles</span>' is the definition.<br/ ><span class="explanation-format__explanation">(barrier is a kind of obstacle)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for barriers that I've seen before include "Obstacles designed to prevent advance or progress" , "Constructions that prevent or impede advance" , "Objects erected to control progress or access as by crowds" , "Obstructions" , "They're put up to block or protect" .)