Snooker player's that young wizard! (6)
I believe the answer is:
potter
I believe this is a double definition.
'snooker player's' is the first definition.
(pots balls)
'young wizard' is the second definition.
(Harry Potter)
'that' is the link.
(Other definitions for potter that I've seen before include "Worker in clay" , "Maker of earthenware vessels" , "Ceramicist" , "One throws and moulds clay" , "Worker in ceramics - move aimlessly" .)