Ran an experiment on (6)
I believe the answer is:
tested
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ran an experiment on</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 tested that I've seen before include "Tried or examined" , "Probed or analysed" , "Subjected to examination or trial" , "Measured for quality or reliability" , "Put to the proof" .)