Crossword Genius

Constituent of many clays (7)

Ross

I believe the answer is:

alumina

(Other definitions for alumina that I've seen before include "Constituent of sapphire" , "emery" , "Metallic oxide that is a constituent of many clays" , "Substance of sapphire" , "Mineral in many clays" .)

I've seen this clue in The Times.
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