Composer, techno fan, finally changes direction (5)
I believe the answer is:
ravel
'composer' is the definition.
(I've seen this before)
'changes direction' is the wordplay.
'changes' becomes 'rave' (I am not sure about this - if you are sure you should believe this answer much more).
'direction' becomes 'l'.
'rave'+'l'='RAVEL'
'techno fan finally' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
(Other definitions for ravel that I've seen before include "Fray; composer" , "note-writer observed" , "Tangle or become tangled" , "Entangle - French composer, d. 1937" , "French composer, Maurice (1875-1937)" .)