Individual delivering a reckoning in the Library? (10)
I believe the answer is:
bookkeeper
'individual' is the definition.
(bookkeeper is a kind of individual)
'a reckoning in the library?' is the wordplay.
I cannot really understand how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'delivering' acts as a link.
Can you help me to learn more?
(Other definitions for bookkeeper that I've seen before include "Business occupation" , "person responsible for financial oversight" , "Accounts official" , "accountant" , "who works to maintain balance" .)