The most common and most likely answer to this crossword clue is the 6 letter word GYPSUM
G
Y
P
S
U
M
More clues leading to the result GYPSUM
- Yankee visiting GP, some said, for plaster of Paris material
- Adhesive binding agent: revolutionary building material
- Cycle courier entering health club to deliver plastering material
- Turning up in drinking vessel, notice mineral
- See back covered in adhesive plaster
- Plastering material to see in face that’s been knocked about
- See in cup knocked over a soft mineral
- Mineral aggregate under pressure below empty gantry
- Mineral given by doctor to tot — surgery’s latest thing to be swallowed
- Mineral primarily gets you plaster source, usually mixed
Buddy explains!

The straight part
We know that "building material" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case building material = gypsum.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 GYPSUM mean?
GYPSUM noun- A mineral consisting of hydrated calcium sulphate. When calcined, it forms plaster of Paris.