Some of these Ravel rejected as a composer (6)
I believe the answer is:
varese
'a composer' is the definition.
(I know that Varese is a composer)
'some of these ravel rejected' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'rejected' is a reversal indicator.
'eserav' can be found hidden inside 'these ravel'.
'eserav' written backwards gives 'VARESE'.
'as' is the link.
(Other definitions for varese that I've seen before include "Italian city" , "European compser" , "Edgar --, composer" , "Dissonant composer" .)