Annulled the sentence, perhaps (6)
I believe the answer is:
erased
'annulled' 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 a link between them that I can't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for erased that I've seen before include "Red sea (anag)" , "'Wiped out, deleted (6)'" , "Rubbed out, expunged" , "Obliterated" , "deleted material" .)