The most common and most likely answer to this crossword clue is the 9 letter word PAPERLESS
I've seen this crossword clue in The Daily Telegraph
P
A
P
E
R
L
E
S
S
Buddy explains!

The straight part
We know that "Like the modern computerised office/with bare walls" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like the modern computerised office/with bare walls = paperless.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 PAPERLESS mean?
PAPERLESS adjective- Without paper.
- Relating to or involving the communication or storage of information electronically, rather than with paper.
- (of a person) Lacking official documentation or evidence of identity.