Untried (8)
I believe the answer is:
untested
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">untried</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that untried can be written as untested)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for untested that I've seen before include "Not tried or proven" , "not entered for examination" , "Not tried or put to proof" , "Pilot may be" , "learner driver" .)