Great skill (8)
(Other definitions for mastery that I've seen before include "in full command" , "dominion" , "Control - supreme skill" , "Comprehensive skill" , "Expert skill" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">great skill</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for artistry that I've seen before include "Superior skill" , "ability" , "The skill to create works of art" , "Creativity" , "Performer's skill" .)
(Other definitions for expertise that I've seen before include "professionalism" , "Adroitness" , "Thorough knowledge" , "Technical skill" , "Skill or knowledge in a particular field" .)