The end room? (3)
I believe the answer is:
den
'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" .)