Crossword Genius

Lightweight thermoplastic, used in packaging (9)

Ross

I believe the answer is:

polythene

(Other definitions for polythene that I've seen before include "A lightweight thermoplastic" , "Synthetic thermoplastic used for packaging, etc" , "Plastic substance" , "Synthetic resin" , "Packaging material -- telephony (anag)" .)

I've seen this clue in The Guardian.
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