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Works aligned here to reserve files? (9)

Ross

I believe the answer is:

bookcases

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'works aligned here' is the definition.
The definition suggests a singular noun but the answer is a plural noun.

'reserve files?' is the wordplay.
'reserve' becomes 'book' (to book something is to reserve it).
'files?' becomes 'cases' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'book'+'cases'='BOOKCASES'

'to' is the link.

Can you help me to learn more?

(Another definition for bookcases that I've seen is " Shelves".)

I've seen this clue in the Sydney Morning Herald.
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