Article not genuine? Editor's embarrassed (7)
I believe the answer is:
ashamed
'embarrassed' is the definition.
(similar in meaning)
'article not genuine? editor's' is the wordplay.
'article' becomes 'a' (English indefinite article).
'not genuine?' becomes 'sham' (I've seen this in another clue).
'editor' becomes 'ed' (abbreviation).
'a'+'sham'+'ed'='ASHAMED'
(Other definitions for ashamed that I've seen before include "Feeling bad after unworthy action" , "Mortified or consciencestricken" , "Sorry" , "He's Adam (anag.)" , "Feeling bad, having done something wrong" .)