Special aptitude (6)
'special aptitude' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for talent that I've seen before include "Old coin for natural ability" , "Special ability, may be natural" , "Natural ability or aptitude" , "Natural aptitude of an old coin" , "Clever folk" .)
(Other definitions for skill that I've seen before include "Knack" , "Expertise, dexterity" , "Expertise; art" , "Special ability" , "Ability acquired by training" .)