Cryptic crossword clue
Sonically testing volcanic rock 4

The most common and most likely answer to this crossword clue is the 4 letter word TUFF

T
U
F
F

Buddy explains!

The straight part
We know that "volcanic rock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case volcanic rock = tuff.
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 TUFF mean?

TUFF noun
  1. A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
TUFF adjective
  1. Strong and resilient; sturdy.
  2. (of food) Difficult to cut or chew.
  3. Rugged or physically hardy.
  4. Stubborn.
  5. (of weather etc) Harsh or severe.
  6. Rowdy or rough.
  7. (of questions, etc.) Difficult or demanding.
  8. Undergoing plastic deformation before breaking.

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