Crossword Genius

Coiled fossil shell of a mollusc (8)

Ross

I believe the answer is:

ammonite

(Other definitions for ammonite that I've seen before include "old nomadic tribesman" , "Spiral fossil" , "marine fossil!" , "Type of fossil" , "Coiled fossil shell of extinct mollusc" .)

I've seen this clue in The Guardian and The Irish Times.
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