Crossword Genius

Thermoplastic material (11)

Ross

I believe the answer is:

polystyrene

(Other definitions for polystyrene that I've seen before include "Synthetic resin making lightweight packaging" , "Light synthetic resin" , "Lightweight synthetic material" , "Moulded synthetic material" , "Synthetic material - let nosey pry (anag)" .)

I've seen this clue in The Independent.
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