Arab is enthralled by Times expert (6)
'expert' is the definition.
(I've seen this before)
'arab is enthralled by times' is the wordplay.
'arab' becomes 'ar' (abbreviation in reference works).
'enthralled by' is an insertion indicator ('enthral' can mean 'capture').
'times' becomes 'tt' (two abbreviations for time).
'is' placed inside 'tt' is 'tist'.
(Other definitions for artist that I've seen before include "Skilful, imaginative, performer", "Painter in dire strait", "Skilled person", "great exponent", "Painter, sculptor etc".)