Romeo possibly rejecting United’s image (7)
I believe the answer is:
montage
'image' is the definition.
(thesaurus)
'romeo possibly rejecting united's' is the wordplay.
'romeo possibly' becomes 'Montague' (Romeo is a member of the Montague family).
'rejecting' is a deletion indicator.
'united' becomes 'U' (abbreviation as in Man U for Manchester United).
'montague' with 'u' taken away is 'MONTAGE'.
(Other definitions for montage that I've seen before include "Film sequence" , "Composite picture" , "Picture comprising disparate elements" , "Collage" , "Picture assembled from separate sections" .)