Cryptic crossword clue
Failed to contain uranium treated incorrectly  7

The most common and most likely answer to this crossword clue is the 7 letter word MISUSED

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Buddy explains!

The straight part
We know that "treated incorrectly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case treated incorrectly = misused.
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 MISUSED mean?

MISUSED verb
  1. To use (something) incorrectly.
  2. To abuse or mistreat (something or someone).
  3. To rape (a woman); later more generally, to sexually abuse (someone).
  4. To abuse verbally, to insult.
MISUSED adjective
  1. Used in an incorrect or inappropriate manner.

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