Limited support? (5)
I believe the answer is:
rails
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">limited support?</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 rails that I've seen before include "Metal bars of a barrier" , "Water birds" , "Train tracks" , "Tracks or barriers" , "Makes a protest" .)