Tendency to do nothing (7)
I believe the answer is:
inertia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tendency to do nothing</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 inertia that I've seen before include "'Sluggishness, indolence (7)'" , "Slowness to act, lack of strength" , "Admonish" , "Chemical or other inactivity" , "Disinclination to act" .)