Crossword Genius

Little boy's room (3)

Ross

I believe the answer is:

den

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

Here is my best explanation:

This clue could be a double definition.

'little boy's' is the first definition.
'Den' can be an answer for 'boy's'. I am not certain of the 'little' bit.

'room' is the second definition.
(den is a kind of room)

Can you help me to learn more?