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

The straight part
We know that "Mishandling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mishandling = muffing.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 MUFFING mean?
MUFFING verb- To drop or mishandle (the ball, a catch etc.); to play badly.
- To mishandle; to bungle.
- Penetration of the inguinal canal (e.g. with a finger, or by pushing the testicle back inside it) as a form of sexual activity among trans women.