Path of a projectile (10)
I believe the answer is:
trajectory
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">path of a projectile</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for trajectory that I've seen before include "Path of a bullet or missile" , "Track of a projectile" , "Path of a projectile" , "Projectile's path" , "Path of an object through the air" .)