Revoke yearbook: second article expunged (5)
I believe the answer is:
annul
'revoke' is the definition.
(I know that revoke can be written as annul)
'yearbook second article expunged' is the wordplay.
I cannot really see how this works, but
'article' could be 'an' (indefinite article) and 'an' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for annul that I've seen before include "Cancel officially" , "Cancel, make void" , "Recall" , "Quash" , "Repeal, rescind" .)