The most common and most likely answer to this crossword clue is the 7 letter word UPENDED
U
P
E
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D
More clues leading to the result UPENDED
Buddy explains!

The straight part
We know that "Flipped" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flipped = upended.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 UPENDED mean?
UPENDED verb- To end up; to set on end.
- To tip or turn over.
- To destroy, invalidate, overthrow, or defeat.