Enough recordings to fill a book? (5)

I believe the answer is:

album

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'book?' is the definition.
(album is a kind of book)

I don't understand how the rest of the clue works.

(Other definitions for album that I've seen before include "Cuttings book" , "Record with multiple tracks" , "Old LP - book of photos" , "Book for, eg, stamps" , "Book of blank pages for collectables, memorabilia etc." .)

I've seen this clue in the Evening Standard.

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