Cryptic crossword clue
Lack of movement in volcano -- it can indeed erupt!   8

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

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Buddy explains!

The straight part
We know that "Lack of movement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lack of movement = inaction.
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 INACTION mean?

INACTION noun
  1. Lack of action or activity or labor

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