Librarians perhaps may fine them (11)

I believe the answer is:

bookkeepers

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

'librarians' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe there's an association between them I don't understand?

'may fine them' is the wordplay.
I cannot really understand how this works, but
'fine' could be 'ok' (synonyms) and 'ok' is present in the answer.
This explanation may well be incorrect...

'perhaps' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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