Natural skill or talent (8)
I believe the answer is:
aptitude
I believe this is a double definition.
'natural skill' is the first definition.
(I've seen this before)
'talent' is the second definition.
(I've seen this in another clue)
(Other definitions for aptitude that I've seen before include "Natural ability or skill" , "Inherent ability, natural talent" , "Natural gift" , "A particular talent or facility" , "Bent" .)