The most common and most likely answer to this crossword clue is the 6 letter word GLITCH
I've seen this crossword clue in The Guardian
G
L
I
T
C
H
More clues leading to the result GLITCH
- Problem with lighting installed in grand church
- Malfunction disheartened girl with restless desire
- Problem settled in Communications centre, no question
- Something wrong? Idiot left to shaft children
- Problem with equipment, needing good fruit pruned
- Bit of a mishap: Grand Canal emptied and burning
- Surveillance organisation almost intercepting drunk’s hiccup
- Gruel ends hunger problem
- Left long after gremlin initiated bug
- Fault of girl’s heartless longing
Buddy explains!

The straight part
We know that "Bit of a mishap" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bit of a mishap = glitch.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 GLITCH mean?
GLITCH noun- A problem affecting function.
- An unexpected behavior in an electrical signal, especially if the signal spontaneously returns to expected behavior after a period of time.
- A bug or an exploit.
- A genre of experimental electronic music since the 1990s, characterized by a deliberate use of sonic artifacts that would normally be viewed as unwanted noise.
- (especially of machines) To experience an intermittent, unexpected, malfunction.
- To perform an exploit or recreate a bug while playing a video game.