The most common and most likely answer to this crossword clue is the 6 letter word UNTIDY
I've seen this crossword clue in The Guardian
U
N
T
I
D
Y
More clues leading to the result UNTIDY
- Dishevelled Eastern ducks released close to boundary
- DIY nut disorganised and messy
- DIY nut working without order
- Slovenly in duty — removed
- Shouted ‘Free Jack’ all over the place?
- Unity Mitford ultimately wound up in mess
- Disunity is not out of order, messy
- How is nudity disorderly?
- Redrafted one new duty in a state
- Disorderly time in college, extremely dingy
Buddy explains!

The straight part
We know that "out of order" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case out of order = untidy.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 UNTIDY mean?
UNTIDY verb- To make untidy, to make a mess
- Sloppy.
- Disorganized.