A bogus journalist, embarrassed (7)
I believe the answer is:
'embarrassed' is the definition.
(similar in meaning)
'a bogus journalist' is the wordplay.
'bogus' becomes 'sham' (I've seen this before).
'journalist' becomes 'ed' (short for editor).
(Other definitions for ashamed that I've seen before include "Abashed - embarrassed" , "Overcome by remorse or guilt" , "Sorry" , "hanging his head" , "Having painful regret for behaviour" .)