The most common and most likely answer to this crossword clue is the 6 plus 1 plus 2 letter word STABLE - DD
S
T
A
B
L
E
-
D
D
Buddy explains!
The straight part
We know that "Firm/accommodation for Arabs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case firm/accommodation for arabs = stable - dd.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.