Cancelled edition after warning us regularly -- all except the leader (8)

I believe the answer is:

annulled

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'cancelled' is the definition.
(annulling is a kind of cancelling)

I can't explain the remainder of the clue.

(Other definitions for annulled that I've seen before include "Cancelled" , "Declared to no longer exist" , "Declared invalid" , "Made legally void" , "Made invalid" .)

I've seen this clue in The Telegraph.

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