Tip of a plane (4)
I believe the answer is:
nose
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tip of a plane</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 nose that I've seen before include "Snout" , "front part of vehicle" , "Nuzzle" , "Organ of smell" , "In-your-face" .)