Crossword Genius

Mineralised relic of a long-dead organism (6)

Ross

I believe the answer is:

fossil

(Other definitions for fossil that I've seen before include "I floss (anag.)" , "old boy?" , "Petrified 9" , "Petrified relic" , "Fogeyish old thing" .)

I've seen this clue in The Times.
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