Crossword Genius

Single stone in the form of an obelisk, say (8)

Ross

I believe the answer is:

monolith

(Other definitions for monolith that I've seen before include "Big pillar" , "Large corporation" , "Very large and characterless building" , "Statue from one block of stone" , "Pillar-like stone" .)

I've seen this clue in The Guardian.
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