The most common and most likely answer to this crossword clue is the 4 plus 6 letter word DAMP COURSE
I've seen this crossword clue in The Times
D
A
M
P
C
O
U
R
S
E
More clues leading to the result DAMP COURSE
- Unexpectedly produces fences in the morning for building protection
- Around a month produces reworked section of wall
- Some housing benefit? And soup?
- No firm going to produce resistant wall feature?
- Check Penny’s lessons in home protection
- A crude mop’s deployed — that stops water rising
- Ma produces new device to keep house dry
- Armed cops patrolling around university, offering protection for building
- A crude mop’s possibly the answer to water in the house
- Mother means to hold firm, providing protection for the home
Buddy explains!
The straight part
We know that "building protection" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case building protection = damp course.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.