Cable support (5)
I believe the answer is:
pylon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cable support</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pylon that I've seen before include "Electric cable tower" , "Power cables supporter" , "power supplier?" , "Elec. cable tower" , "Metal structure for carrying overhead cables" .)