Crossword Genius

The end room? (3)

Ross

I believe the answer is:

den

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

'room?' is the definition.
(I know that den is a type of room)

'the end' is the wordplay.
'end' can be anagrammed to 'DEN'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for den that I've seen before include "Miserable place" , "Animal lair or gent's study" , "Habitation of wild animals (3)" , "Private office" , "Animal's lair or man's study" .)

I've seen this clue in the Evening Standard.
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