Deduce nitric oxide produces large fire (7)
I believe the answer is:
inferno
'large fire' is the definition.
(I've seen this before)
'deduce nitric oxide' is the wordplay.
'deduce' becomes 'infer' ('infer' can be a synonym of 'deduce').
'nitric oxide' becomes 'no' (NO is the chemical formula for nitric oxide).
'infer'+'no'='INFERNO'
'produces' is the link.
(Other definitions for inferno that I've seen before include "(Fiery) Hell" , "Dante's Hell" , "blazer?" , "Hellish poem" , "Dante's scene of horror" .)