Planet's path (5)
I believe the answer is:
orbit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">planet's path</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 orbit that I've seen before include "Stellar path" , "fly in a circle" , "Path of planet around sun" , "Circumnavigate" , "Sphere of activity" .)