Relaxation room (3)
I believe the answer is:
den
'relaxation room' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for den that I've seen before include "Habitation of wild animals (3)" , "Animal habitation" , "Animal's lair or gent's study" , "Animal's home or gent's study" , "Miserable place" .)