Locating device (5)
I believe the answer is:
radar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">locating device</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 radar that I've seen before include "Equipment for locating objects" , "Measuring device that locates distant objects" , "Range and direction finding equipment" , "Locator that uses a microwave echo" , "Position detector using radio wave pulses" .)