The little boy's room (3)
I believe the answer is:
den
This might be a double definition.
'the little boy's' is the first definition.
'Den' can be an answer for 'boy's'. I am not certain of the 'the little' bit.
'room' is the second definition.
(I know that den is a type of room)
Can you help me to learn more?
(Other definitions for den that I've seen before include "Room for work or play" , "Animal's home or gent's study" , "Habitation of wild animals (3)" , "Animal's lair or man's study" , "Home of the beast" .)