Crossword Genius

Building material in East London obtains top rating (8)

Ross

I believe the answer is:

asbestos

'building material' is the definition.

I can't explain the remainder of the clue.

(Other definitions for asbestos that I've seen before include "we now know to be dangerous" , "Fire-resistant material dangerous to health" , "Heat-resistant material" , "Survivor of heat" , "Fire-retardant material" .)

I've seen this clue in The Times.
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