Cancel yearly publication, after fifth has been shelved (5)

I believe the answer is:

annul

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'cancel' is the definition.
(I know that annul is a type of cancel)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for annul that I've seen before include "Cancel or render void" , "Scrap" , "Make invalid" , "Declare (a law) invalid" , "Cancel officially" .)

I've seen this clue in The Telegraph.

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