The most common and most likely answer to this crossword clue is the 8 letter word GIRASOLE
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More clues leading to the result GIRASOLE
Buddy explains!
The straight part
We know that "stone that glows" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stone that glows = girasole.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 GIRASOLE mean?
GIRASOLE noun- A variety of sunflower, Helianthus tuberosus, native to North America, having yellow flower heads and edible tubers.
- The tuber of this plant, eaten as a vegetable.
- A fire opal.