This chemical could be deadly, eh? (8)
I believe the answer is:
aldehyde
'this chemical' is the definition.
'could be deadly eh?' is the wordplay.
'could be' indicates an anagram.
'deadly'+'eh'='deadlyeh'
'deadlyeh' is an anagram of 'ALDEHYDE'.
(Other definitions for aldehyde that I've seen before include "chemical" , "Organic compound" .)
I've seen this clue in The Telegraph.
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