Accountant's concern (5)

I think it could be either:

Which length description are you looking for?:

3,4

books

'accountant's concern' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for books that I've seen before include "Tomes, volumes" , "Reserves" , "Reserve tickets" , "See 1" .)

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