Cryptic crossword clue
Calamity resulting from Diana’s bloomer 8

The most common and most likely answer to this crossword clue is the 8 letter word DISASTER

I've seen this crossword clue in The Daily Telegraph
D
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S
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Buddy explains!

The straight part
We know that "Calamity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case calamity = disaster.
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 DISASTER mean?

DISASTER noun
  1. An unexpected natural or man-made catastrophe of substantial extent causing significant physical damage or destruction, loss of life or sometimes permanent change to the natural environment.
  2. An unforeseen event causing great loss, upset or unpleasantness of whatever kind.

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