Propensity (4)
'propensity' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for tendency that I've seen before include "movement" , "Likelihood - inclination" , "Inclination towards a particular behaviour" , "Predisposition" , "Penchant, inclination" .)
'propensity' is the definition.
(bent can mean a propensity or tendency)
This is all the clue.
(Other definitions for bent that I've seen before include "Distorted" , "passion" , "Misshapen" , "Sharply curved, grass" , "Deformed" .)