Flair, aptitude (6)
I believe the answer is:
talent
I believe this clue is a double definition.
'flair' is the first definition.
(I've seen this before)
'aptitude' is the second definition.
(I know that talent is a type of natural ability)
(Other definitions for talent that I've seen before include "Flair, aptitude" , "Special ability, may be natural" , "Special gift" , "Type of scout - innate ability - old Greek money" , "Inborn ability or facility" .)