The most common and most likely answer to this crossword clue is the 8 letter word UNGENTLE
I've seen this crossword clue in Independent
U
N
G
E
N
T
L
E
Buddy explains!
The straight part
We know that "rough" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rough = ungentle.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 UNGENTLE mean?
UNGENTLE adjective- Showing a lack of gentleness, kindness or compassion.
- Not acting according to accepted ethics or standards of behaviour.