The most common and most likely answer to this crossword clue is the 2 plus 6 plus 1 letter word EN SUITE} :
I've seen this crossword clue in The Daily Telegraph
E
N
S
U
I
T
E
}
:
Buddy explains!
The straight part
We know that "Facilities in" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case facilities in = en suite} :.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 EN SUITE} : mean?
EN SUITE} : adjective- As part of a set or series.
- (of a bathroom etc) Connected to a bedroom.