The most common and most likely answer to this crossword clue is the 9 letter word BREAKDOWN
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More clues leading to the result BREAKDOWN
Buddy explains!

The straight part
We know that "Failure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case failure = breakdown.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 BREAKDOWN mean?
BREAKDOWN noun- A failure, particularly mechanical; something that has failed
- A physical collapse or lapse of mental stability
- Listing, division or categorization in great detail
- A detailed description of a forthcoming project, including the characters and roles required.
- Breaking of chemical bonds within a compound to produce simpler compounds or elements.
- A musical technique by which the music is stripped down, becoming simpler, varying in heaviness depending on the genre.
- A loss of organization (of the parts of a system).
- A noisy, rapid, shuffling dance engaged in competitively by a number of persons or pairs in succession, common in Southern United States African American music.
- Any crude, noisy dance performed by shuffling the feet, usually by one person at a time.
- Any rapid bluegrass dance tune, especially featuring a five-string banjo.
- The percussion break of songs chosen by a DJ for use in hip-hop music.