Crossword Genius

Modelling medium (4)

Ross

I believe the answer is:

clay

(Other definitions for clay that I've seen before include "Soil for moulding" , "Tenacious ductile earth" , "Material used for bricks, ceramics etc" , "Potter's material" , "Wet, fine-grained earth" .)

I've seen this clue in the Sydney Morning Herald.
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