The most common and most likely answer to this crossword clue is the 9 letter word ROUGHENED
I've seen this crossword clue in The Times
R
O
U
G
H
E
N
E
D
Buddy explains!

The straight part
We know that "became more crude" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case became more crude = roughened.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 ROUGHENED mean?
ROUGHENED verb- To make rough.
- To become rough.