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 Mirror and the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.