Small flat (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
studio
'small flat' is the definition.
This is all the clue.
(Other definitions for studio that I've seen before include "Room to make radio or television programme" , "Apartment with one main room" , "Where an artist works" , "Recording or painting workshop" , "Building for movie-making" .)