Timing device (9)
I believe the answer is:
stopwatch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">timing device</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 stopwatch that I've seen before include "Timer for races, etc" , "Timepiece for exact timing" , "Timing device, for sports perhaps" , "Timepiece used in racing" , "instrument" .)