Composer left after wild party (5)
I believe the answer is:
Here is my best explanation:
'composer' is the definition.
'left after wild party' is the subsidiary indication.
'left' becomes 'l' (common abbreviation).
'after' means one lot of letters go next to another.
'wild party' becomes 'rave' (I've seen this before).
'l' put after 'rave' is 'ravel'.
(Other definitions for ravel that I've seen before include "Bolero composer, d. 1937", "Entangle - French composer, d. 1937", "Tangle - untangle - French composer, d. 1937", "French composer, Maurice (1875-1937)", "Bolero's composer", "Tangle or become tangled", "Fray; composer", "Make more complicated - French composer, d. 1937" and "Composer of Bolero".)