Eg Romeo dismissing Juliet's second film sequence (7)
I believe the answer is:
montage
'film sequence' is the definition.
(a montage is a sequence of film clips)
'eg romeo dismissing juliet's second' is the wordplay.
'eg romeo' becomes 'Montague' (Romeo is a member of the Montague family).
'dismissing' is a deletion indicator.
'juliet's second' becomes 'u' (2nd letter of 'juliet').
'montague' with 'u' taken out is 'MONTAGE'.
(Other definitions for montage that I've seen before include "Artwork - not a gem (anag)" , "Picture assembled from separate sections" , "Film sequence" , "Artwork formed from different elements pieced together" , "Composition made by sticking images together" .)