Crossword Genius

Dangerous material as used by top mapmakers (8)

Ross

I believe the answer is:

asbestos

'dangerous material' is the definition.
(I've seen this before)

'as used by top mapmakers' is the wordplay.
'used by' is a charade indicator (letters next to each other).
'top' becomes 'best' (associated in meaning).
'mapmakers' becomes 'OS' (Ordnance Survey).
'as'+'best'+'os'='ASBESTOS'

(Other definitions for asbestos that I've seen before include "Fire-resistant material dangerous to health" , "we now know to be dangerous" , "Incombustible material" , "Fibrous material, doesn't burn" , "you can't inflame this" .)

I've seen this clue in The Telegraph.
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