Natural aptitude or skill (6)
I believe the answer is:
talent
I believe this is a double definition.
'natural aptitude' is the first definition.
(I've seen this before)
'skill' is the second definition.
(talent can mean a skill or ability)
(Other definitions for talent that I've seen before include "Natural ability or flair" , "Natural ability for some activity" , "Flair, aptitude" , "Coin at one time" , "Type of scout - innate ability - old Greek money" .)