Chuck out some of the rejections (5)
I believe the answer is:
eject
'chuck out' is the definition.
(synonyms)
'some of the rejections' is the wordplay.
'some of' indicates a hidden word.
'EJECT' is hidden within 'rejections'.
(Other definitions for eject that I've seen before include "Release a cassette from a video recorder, for instance" , "Boot out" , "bounce" , "Remove forcibly" , "Dismiss" .)