The most common and most likely answer to this crossword clue is the 9 letter word DISREGARD
I've seen this crossword clue in Financial Times
D
I
S
R
E
G
A
R
D
More clues leading to the result DISREGARD
- Don’t give any attention to work sir graded
- Ignore inspector's gaze
- Reads grid, wrongly showing neglect
- Slight drag returning after crazy rides
- Being in command, is Reg ardently put aside?
- Ignore traders and dig around, short of time
- Carelessness is clear in retrospect about son getting bad grade
- Ignore police officers on patrol, it’s said
Buddy explains!

The straight part
We know that "Ignore" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ignore = disregard.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 DISREGARD mean?
DISREGARD noun- The act or state of deliberately not paying attention or caring about; misregard.
- To ignore; pay no attention to.