Students' study? (3)

I believe the answer is:

den

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

'study' is the definition.
(den can mean an office or study)

'students'' is the wordplay.
'DEN' is hidden within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for den that I've seen before include "Room for work or play" , "Animal's lair or gent's study" , "Animal's home or gent's study" , "Gentleman's study or animal's lair" , "Cave" .)

I've seen this clue in the Evening Standard and The Mirror.

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