The most common and most likely answer to this crossword clue is the 7 letter word CUBICLE
I've seen this crossword clue in The Guardian
C
U
B
I
C
L
E
More clues leading to the result CUBICLE
- Small room, not half brilliant for accommodating superior writer
- Stall and hit rocks left nearer the bottom
- Speaker’s three-dimensional compartment
- Copper on bike getting Young Conservative taken off into cell
- Cell walls of course keeping line by university writer
- Compartment of solid lead half finished
- Rookie’s in charge of the French cell
- Changing room twenty-seven maybe contains one cold student
- One hundred and fifty die outside changing room
Buddy explains!

The straight part
We know that "Small room" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case small room = cubicle.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CUBICLE mean?
CUBICLE noun- A small separate part or one of the compartments of a room, especially in a work environment.
- A small enclosure at a swimming pool etc. used to provide personal privacy when changing.
- A small enclosure in a public toilet for individual use.