The most common and most likely answer to this crossword clue is the 9 letter word UNREFINED
I've seen this crossword clue in The Guardian
U
N
R
E
F
I
N
E
D
More clues leading to the result UNREFINED
Buddy explains!

The straight part
We know that "Crude" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crude = unrefined.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 UNREFINED mean?
UNREFINED adjective- Crude, raw or unprocessed
- (of a person) lacking refinement; uncouth