The most common and most likely answer to this crossword clue is the 5 plus 2 plus 5 letter word BLOCK OF FLATS
B
L
O
C
K
O
F
F
L
A
T
S
Buddy explains!
The straight part
We know that "high-rise housing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case high-rise housing = block of flats.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.