British see about masking trendy name on article (2,4)
I believe the answer is:
by-line
'name on article' is the definition.
'british see about masking trendy' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'see' becomes 'ely' (example where cathedral located in diocese**).
'about' is a reversal indicator.
'masking' means one lot of letters goes inside another.
'trendy' becomes 'in'.
'ely' backwards is 'yle'.
'yle' going around 'in' is 'yline'.
'b'+'yline'='BY-LINE'
(Other definitions for by-line that I've seen before include "It gives the name of the writer of an article" , "Reporter's name" , "Author's credit in paper" , "It gives the name of the writer of a report" , "Newspaper article naming the writer" .)