Crossword Genius

--- gel, drying agent (6)

Ross

I believe the answer is:

silica

(Other definitions for silica that I've seen before include "Mineral found as quartz and opal" , "Main constituent of sand" , "Eg, quartz" , "Oxide occurring as quartz and used in making glass" , "Constituent of sandstone and quartz" .)

I've seen this clue in The Times.
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