Cancel yearly publication, after fifth has been shelved (5)
I believe the answer is:
annul
'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" .)