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 they are linked in a way I don't understand?
I don't understand how the remainder of the clue works.
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" .)