Cryptic crossword clue
It’s rocky as result of drop in share 8

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

I've seen this crossword clue in The Guardian
D
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Buddy explains!

The straight part
We know that "It’s rocky" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s rocky = dolomite.
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 DOLOMITE mean?

DOLOMITE noun
  1. A saline evaporite consisting of a mixed calcium and magnesium carbonate, with the chemical formula CaMg(CO3)2; it also exists as the rock dolostone.

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