A top sketch that's second to none from Duck Soup with lead producing material that's considered very dangerous (8)
I believe the answer is:
asbestos
'duck soup with lead producing material that's considered very dangerous' is the definition.
I can't judge whether this defines the answer.
'a top sketch that's second to none' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
'top' could be 'best' (associated in meaning) and 'best' is present in the answer.
'second' could be 's' (common abbreviation) and 's' is present in the answer.
'none' could be 'o' and 'o' is found within the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'from' acts as a link.
Can you help me to learn more?
(Other definitions for asbestos that I've seen before include "I might end up lagging" , "Fire defence" , "Old fire-retardant" , "Fire-resistant material dangerous to health" , "Fireproof material, now known to be dangerous" .)