The most common and most likely answer to this crossword clue is the 5 letter word IONIC
I've seen this crossword clue in The Times
I
O
N
I
C
More clues leading to the result IONIC
- Like an order mocking customer finally leaves
- Kind of bond that's archetypal, caught only once
- King or queen deposed, meaning the opposite of order!
- Right to leave mildly humorous order
- It’s charged by leaders of imperial cavalry and foot
- Sarcastic – just not right; like some columns
- Charged I note, first sent off
- Ancient Greek impresario
- Superhuman removing entrance for Greek school
- Sort of column written by 10 taking 13
Buddy explains!

The straight part
We know that "order" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case order = ionic.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 IONIC mean?
IONIC adjective- Of, relating to, or containing ions