Scrap yearly book missing final article (5)

I believe the answer is:

annul

I'm a little stuck... Click here to teach me more about this clue!

'scrap' is the definition.
(I've seen this before)

'yearly book missing final article' is the wordplay.
I cannot quite see how this works, but
'article' could be 'an' (indefinite article) and 'an' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for annul that I've seen before include "Cancel, make void" , "Cancel or render void" , "Make invalid" , "Scrap" , "Cancel, abolish" .)

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.