Composer leaves meal unfinished (5)
I believe the answer is:
suppe
'composer' is the definition.
(I've seen this before)
'meal unfinished' is the wordplay.
'meal' becomes 'supper' (supper is a kind of meal).
'unfinished' means to remove the last letter.
'supper' with its final letter taken off is 'SUPPE'.
'leaves' acts as a link.
(Other definitions for suppe that I've seen before include "Franz von -, Austrian light opera composer" , "Composer of Poet and Peasant and Pique Dame light operas" , "Composer of the Light Cavalry overture" .)