Forbid British article (3)
I believe the answer is:
ban
'forbid' is the definition.
(banning is a kind of forbiding)
'british article' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in BBC).
'article' becomes 'an' (English indefinite article).
'b'+'an'='BAN'
(Other definitions for ban that I've seen before include "Officially prohibit" , "'Forbid, prohibit (3)'" , "Stop" , "the calling of young vassals" , "Embargo" .)