Cryptic crossword clue
Explosive buried under mountain peak to yield clay 9

The most common and most likely answer to this crossword clue is the 9 letter word BENTONITE

B
E
N
T
O
N
I
T
E

Buddy explains!

The straight part
We know that "clay" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clay = bentonite.
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 BENTONITE mean?

BENTONITE noun
  1. Any of several impure clay minerals consisting mostly of montmorillonite.
  2. A porous clay formed by the decomposition of volcanic ash that swells 5 to 6 times its original volume in the presence of water.

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