Crossword Genius

Nora begins to use alias in Birr perplexing catalogue keepers (10)

Ross

I believe the answer is:

librarians

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'keepers' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for librarians that I've seen is " Larkin and colleagues".)

I've seen this clue in The Irish Times.
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