The most common and most likely answer to this crossword clue is the 9 letter word NAIVETIES
I've seen this crossword clue in Financial Times
N
A
I
V
E
T
I
E
S
More clues leading to the result NAIVETIES
Buddy explains!

The straight part
We know that "Artless states" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case artless states = naiveties.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 NAIVETIES mean?
NAIVETIES noun- Lack of sophistication, experience, judgement or worldliness; artlessness; gullibility; credulity.