Test drive (5,3)
I believe the answer is:
trial run
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">test drive</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for trial run that I've seen before include "test-drive" , "Test, try-out" , "'Preliminary test of how something works (5,3)'" , "Experimental outing" , "Pilot" .)