The most common and most likely answer to this crossword clue is the 7 letter word GROGRAM
I've seen this crossword clue in Independent
G
R
O
G
R
A
M
More clues leading to the result GROGRAM
- Drink stuff – stiff stuff!
- Coarse fabric is rum stuff
- Material page removed from grand plan
- Ahead of strike, navy issue coarse stuff
- Group wiping up a metric unit in coarse material
- Coarse cloth is good stuff, holding fearsome giant losing his footing
- Coarse stuff made with alcoholic drink and butter
- Great, Indian soap turns up with hard stuff
Buddy explains!

The straight part
We know that "coarse material" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coarse material = grogram.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 GROGRAM mean?
GROGRAM noun- A strong, rough fabric made up of a mixture of silk, and mohair or wool.
- A garment made from this fabric.