Range of influence (5)
I believe the answer is:
orbit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">range of influence</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 "Path eg of heavenly body" , "Path of planet etc" , "Revolution" , "Revolve round" , "area of activity" .)