Not allowed to quote Shakespeare (6)
I believe the answer is:
barred
'not allowed' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe you can see an association between them that I can't see?
'quote shakespeare' is the wordplay.
'quote' shows a homophone (sound like) (I've seen 'quoted' mean this).
'shakespeare' becomes 'bard' (I've seen this before).
'bard' is a homophone of 'BARRED'.
'to' is the link.
Can you help me to learn more?
(Other definitions for barred that I've seen before include "Wouldn't allow" , "Refused access to, say pub" , "Refused entry to local pub" , "Prohibited" , "Precluded, obstructed" .)