Crossword Genius

Chatters about book to get bottles (7)

Ross

I believe the answer is:

magnums

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

'bottles' is the definition.
(magnum is a kind of bottle)

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

Can you help me to learn more?

(Another definition for magnums that I've seen is " Large wine bottles".)

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