Little boy's room (3)
I believe the answer is:
den
This might be a double definition.
'little boy's' is the first definition.
'Den' can be an answer for 'boy's'. I'm not certain of 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 "Animal habitation" , "Lair for animal or study for gent" , "Hideaway" , "Private office" , "Wild animal's lair" .)