Tower for guiding pilots (5)
I believe the answer is:
pylon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tower for guiding pilots</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pylon that I've seen before include "Support for cables" , "Grid cable support" , "Electric cable support" , "it may mark a turning point" , "High-tension power line support" .)