Music or painting (3)
I believe the answer is:
art
'music or painting' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for art that I've seen before include "Beautiful or significant products of human creativity" , "Skill, knack" , "-- Garfunkel, singer" , "Skill, craft" , "Creative works; skill" .)