Inclination, propensity (8)
I believe the answer is:
tendency
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">inclination</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that tendency is a type of inclination)</span><br/ ><br/ >'<span class="explanation-format__original">propensity</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that propensity can be written as tendency)</span><br/ ><br/ ></span>
(Other definitions for tendency that I've seen before include "Penchant, inclination" , "Predisposition" , "'Inclination, disposition (8)'" , "Political group" , "Likelihood - inclination" .)