Propensity, inclination (8)
I believe the answer is:
tendency
This clue is a double definition.
'propensity' is the first definition.
(I know that propensity can be written as tendency)
'inclination' is the second definition.
(I know that inclination can be written as tendency)
(Other definitions for tendency that I've seen before include "bent" , "Inclination or leaning" , "Proclivity" , "movement" , "Political group" .)