In favour of Democrat interrupting US president getting banned (9)
I believe the answer is:
forbidden
'banned' is the definition.
(I've seen this before)
'in favour of democrat interrupting us president' is the wordplay.
'in favour of' becomes 'for' (being for a particular cause).
'democrat' becomes 'd'.
'interrupting' indicates putting letters inside.
'us president' becomes 'Biden' (Joe Biden).
'd' going inside 'biden' is 'bidden'.
'for'+'bidden'='FORBIDDEN'
'getting' is the link.
(Other definitions for forbidden that I've seen before include "not 35 [PERMISSIBLE]" , "Prohibited, taboo" , "Disallowed, banned" , "This fruit is always more enticing" , "Proscribed" .)