Resistance to change (7)
I believe the answer is:
inertia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">resistance to change</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 "Motion (if any) when no external force is applied" , "Torpor" , "I retain (anag) - the tendency to retain same speed and direction" , "Slowness to move or act" , "Tendency to inaction" .)