Where very small notes are recorded? (6-4)

'notes are recorded?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'where very small' is the wordplay.
I cannot really understand how this works, but
'small' could be 'minute' (similar in meaning) and 'minute' is found within the answer.
The remaining letters 'book' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?