Book recollecting meeting he originally organised (10)

I believe the answer is:

eighteenmo

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

'book' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?

'recollecting meeting he originally organised' is the wordplay.
'recollecting' indicates an anagram.
'originally' suggests taking the first letters.
The first letter of 'organised' is 'o'.
'meeting'+'he'='meetinghe'
'meetinghe' anagrammed gives 'eighteenm'.
'eighteenm'+'o'='EIGHTEENMO'

Can you help me to learn more?

(Other definitions for eighteenmo that I've seen before include "Size of diary perhaps" , "Size of book page" .)

I've seen this clue in The 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.