Study article released by university chief (3)

I believe the answer is:

den

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'study' is the definition.
(term for a study or office)

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

(Other definitions for den that I've seen before include "Hidden lair of an animal" , "Animal's lair or man's study" , "Hiding place" , "Animal shelter" , "Home of the beast" .)

I've seen this clue in The Independent.

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