Cryptic crossword clue
Disaster at stock index – move up to dissolve essential bonds 8

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

M
E
L
T
D
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W
N

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

MELTDOWN noun
  1. Severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping.
  2. A situation being likened to a nuclear meltdown; a crisis.
  3. A tantrum.

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