A writer to shut up? (3)
I believe the answer is:
pen
I believe this is a double definition.
'a writer' is the first definition.
(I've seen this before)
'shut up?' is the second definition.
(thesaurus)
'to' acts as a link.
(Other definitions for pen that I've seen before include "Write" , "Swan for the writer" , "International Association of poets, playwrights etc" , "Pound" , "See 20" .)