Overshadow some movie clips eventually (7)
I believe the answer is:
eclipse
'overshadow' is the definition.
(I know that overshadow can be written as eclipse)
'some movie clips eventually' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'ECLIPSE' is hidden within 'movie clips eventually'.
(Other definitions for eclipse that I've seen before include "Outdo" , "The obscuring of one celestial body by another" , "Surpass in achievement" , "The blotting out of a heavenly body" , "When one celestial body obscures another" .)