The most common and most likely answer to this crossword clue is the 8 letter word SICKNESS
I've seen this crossword clue in The Guardian
S
I
C
K
N
E
S
S
More clues leading to the result SICKNESS
- As it was written by King: ‘head disorder‘
- Complaint of Labour leader lacking in fluency
- It’s not looking good as an option for union
- About to break polished sink on Cockney head? That causes worry
- Sis's neck is crooked — it's an ailment
- Complaint of insincerity when student drops out
- Sloppy kiss scene has no end, it is vomit-inducing
- Unfortunately kisses can leave a malady
Buddy explains!
The straight part
We know that "disorder" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disorder = sickness.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 SICKNESS mean?
SICKNESS noun- The quality or state of being sick or diseased; illness.
- Nausea; qualmishness; as, sickness of stomach.
- The analogical misuse of a rarer or marked grammatical case in the place of a more common or unmarked case.