Heat-resistant glass (5)

I believe the answer is:

pyrex

'heat-resistant glass' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for pyrex that I've seen before include "Heat-proof ovenware" , "Heatproof glass" , "Heat-resistant glass" , "Heat-resistant glassware used in cooking" .)

I've seen this clue in The Telegraph, the Newsday, The Independent and The Sun.

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