The most common and most likely answer to this crossword clue is the 6 letter word BROKEN
I've seen this crossword clue in The Guardian
B
R
O
K
E
N
More clues leading to the result BROKEN
- Impoverished north on its knees
- Smashed gun having incurred fine
- Brother Livingstone is finished
- Out of order, like 15 in rows and columns here
- Faulty globe put up, given knowledge
- Having no money there and terribly overwhelmed with sadness
- What could make her date distraught
- Faulty knowledge of Scotland — brother should be on top of it
- Wild robin Kenneth’s caught and tamed
- What could make the dear very upset
Buddy explains!

The straight part
We know that "Out of order/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/out of order = broken.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 BROKEN mean?
BROKEN verb- To separate into two or more pieces, to fracture or crack, by a process that cannot easily be reversed for reassembly.
- To divide (something, often money) into smaller units.
- To cause (a person or animal) to lose spirit or will; to crush the spirits of.
- To be crushed, or overwhelmed with sorrow or grief.
- To interrupt; to destroy the continuity of; to dissolve or terminate.
- To ruin financially.
- To violate, to not adhere to.
- (of a fever) To pass the most dangerous part of the illness; to go down, in terms of temperature.
- (of a spell of settled weather) To end.
- (of a storm) To begin; to end.
- (of morning, dawn, day etc.) To arrive.
- To render (a game) unchallenging by altering its rules or exploiting loopholes or weaknesses in them in a way that gives a player an unfair advantage.
- To stop, or to cause to stop, functioning properly or altogether.
- To cause (a barrier) to no longer bar.
- To destroy the arrangement of; to throw into disorder; to pierce.
- (of a wave of water) To collapse into surf, after arriving in shallow water.
- To burst forth; to make its way; to come into view.
- To interrupt or cease one's work or occupation temporarily.
- To interrupt (a fall) by inserting something so that the falling object does not (immediately) hit something else beneath.
- To disclose or make known an item of news, etc.
- (of a sound) To become audible suddenly.
- To change a steady state abruptly.
- To suddenly become.
- Of a male voice, to become deeper at puberty.
- Of a voice, to alter in type due to emotion or strain: in men generally to go up, in women sometimes to go down; to crack.
- To surpass or do better than (a specific number), to do better than (a record), setting a new record.
- :
- (most often in the passive tense) To demote, to reduce the military rank of.
- To end (a connection), to disconnect.
- (of an emulsion) To demulsify.
- To counter-attack
- To lay open, as a purpose; to disclose, divulge, or communicate.
- To become weakened in constitution or faculties; to lose health or strength.
- To fail in business; to become bankrupt.
- To destroy the strength, firmness, or consistency of.
- To destroy the official character and standing of; to cashier; to dismiss.
- To make an abrupt or sudden change; to change the gait.
- To fall out; to terminate friendship.
- To terminate the execution of a program before normal completion.
- To suspend the execution of a program during debugging so that the state of the program can be investigated.
- Fragmented, in separate pieces.
- (of a promise, etc) Breached; violated; not kept.
- Non-functional; not functioning properly.
- (of a person) Completely defeated and dispirited; shattered; destroyed.
- Having no money; bankrupt, broke.
- (of land) Uneven.
- (of a tactic or option) Overpowered; overly powerful; too powerful.