Artistic movement from ballet's lead absorbed in music playing (6)
I believe the answer is:
cubism
'artistic movement' is the definition.
(cubism is a kind of artistic movement)
'ballet's lead absorbed in music playing' is the wordplay.
'lead' suggests taking the first letters.
'absorbed in' means one lot of letters goes inside another.
'playing' is an anagram indicator.
The first letter of 'ballets' is 'b'.
'music' with letters rearranged gives 'cuism'.
'b' going into 'cuism' is 'CUBISM'.
'from' is the link.
(Other definitions for cubism that I've seen before include "Artistic movement in France beginning in early 20th century" , "C 20 painting style (Braque, Picasso)" , "art school" , "A modern art movement" , "Art movement pioneered by Braque and Picasso before 1914" .)