Checking, having change of heart and banning (7)

I believe the answer is:

vetoing

'banning' is the definition.
The answer and definition can be both to do with communicating as well as being present participle verbs.
Perhaps you can see a link between them that I don't see?

I can't explain the remainder of the clue.

(Another definition for vetoing that I've seen is " Rejecting a proposal made by a lawmaking body".)

I've seen this clue in The Guardian.

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