The most common and most likely answer to this crossword clue is the 9 letter word DIAGNOSIS
I've seen this crossword clue in The Guardian
D
I
A
G
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S
More clues leading to the result DIAGNOSIS
- Identification of disease in dogs is a diversion
- Identification of woman, ’orrible one, no relation
- Doing as ordered one's reaching conclusion
- Ailing leader is dosing up, because of this?
- Air assistance coming back with one second opinion
- Possibly delivered by a GP doing as is ordered
- Wrongdoing, as is examiner’s opinion
- Ill-judgment.
- Doing as is set out will offer identification of condition
- Verdict: is engaged in air support, getting elevated
Buddy explains!

The straight part
We know that "Ill-judgment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ill-judgment = diagnosis.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 DIAGNOSIS mean?
DIAGNOSIS verb- To determine which disease is causing a sick person's signs and symptoms; to find the diagnosis.
- (by extension) To determine the cause of a problem.
- The identification of the nature and cause of an illness.
- The identification of the nature and cause of something (of any nature).
- A written description of a species or other taxon serving to distinguish that species from all others. Especially, a description written in Latin and published.