The most common and most likely answer to this crossword clue is the 9 letter word SATURATES
I've seen this crossword clue in Independent
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More clues leading to the result SATURATES
Buddy explains!
The straight part
We know that "SATURATES An anagram of (rudely) TREAT US AS / SATURATES An anagram of (rudely) TREAT US AS" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case saturates an anagram of (rudely) treat us as / saturates an anagram of (rudely) treat us as = saturates.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 SATURATES mean?
SATURATES verb- To cause to become completely impregnated, or soaked (especially with a liquid).
- To fill to excess.
- To satisfy the affinity of; to cause a substance to become inert by chemical combination with all that it can hold.
- To render pure, or of a colour free from white light.