Tendency to remain unchanged (7)
I believe the answer is:
inertia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tendency to remain unchanged</span>' is the definition.<br/ ><span class="explanation-format__explanation">(inertia can mean a tendency to stay the same)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for inertia that I've seen before include "I retain (anag) - the tendency to retain same speed and direction" , "Slowness to act, lassitude" , "Slowness to move or act" , "Motionlessness" , "Passiveness" .)