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The ClueInclination (10 letter answer)
NotesThe answer PROPENSITY is so rare that it appears less than once every 2500 puzzles.
DefinitionPROPENSITY as a noun:
1. (leaning, propensity, tendency) = an inclination to do something; "he felt leanings toward frivolity"
2. (proclivity, propensity, leaning) = a natural inclination; "he has a proclivity for exaggeration"
3. (aptness, propensity) = a disposition to behave in a certain way; "the aptness of iron to rust"; "the propensity of disease to spread"