Crossword Genius

The study of lions? (3)

Ross

I believe the answer is:

den

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for den that I've seen before include "Cave" , "Animals' shelter" , "Home of the beast" , "Room for work or play" , "Animal's lair or gent's study" .)

I've seen this clue in The Globe and Mail.
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