Dormancy; inertness (8)
I believe the answer is:
inaction
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">dormancy</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">inertness</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for inaction that I've seen before include "doing nothing whatsoever" , "Inertia" , "Lack of movement or endeavour" , "Failure to do anything" , "Ionic tan (anag.)" .)