Crossword Genius

Vicious Scotsman pursuing old boy produces glass (8)

Ross

I believe the answer is:

obsidian

(Other definitions for obsidian that I've seen before include "Dark glass-like rock" , "Glass bottle may be in this" , "Glassy black igneous rock" , "Volcanic glass-like rock" , "A hard black volcanic glass" .)

I've seen this clue in The Sun.
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