Great skill (8)
'great skill' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for artistry that I've seen before include "Expertise" , "ability" , "Creative skill learned by study and practice" , "Genius" , "Creative workmanship" .)
(Other definitions for expertise that I've seen before include "Thorough knowledge" , "Mastery, proficiency" , "Skill or knowledge in a particular field" , "Craft" , "professionalism" .)