A world of information in the geography class (5)

I believe the answer is:

globe

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'a world' is the definition.
('globe' can be a synonym of 'world')

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

(Other definitions for globe that I've seen before include "House 8 [OF SHAKESPEARE]" , "Planet Earth" , "Shakespeare's theatre" , "Rounded object" , "Spherical map" .)

I've seen this clue in the Evening Standard.

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