The most common and most likely answer to this crossword clue is the 7 letter word MISUSES
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More clues leading to the result MISUSES
Buddy explains!

The straight part
We know that "Bad applications" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bad applications = misuses.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 MISUSES mean?
MISUSES noun- An incorrect, improper or unlawful use of something.
- To use (something) incorrectly.
- To abuse or mistreat (something or someone).
- To rape (a woman); later more generally, to sexually abuse (someone).
- To abuse verbally, to insult.