Presume nuclear bomb (second) created a wildfire (7)
I believe the answer is:
inferno
'presume nuclear bomb second created a wildfire' is the definition.
I can't judge whether this defines the answer.
'presume nuclear bomb second' is the wordplay.
'presume' becomes 'infer' (I've seen this before).
'nuclear' becomes 'n' (this might be a standard abbreviation of which I'm unaware).
'bomb second' becomes 'o' (2nd letter of 'bomb').
'infer'+'n'+'o'='INFERNO'
Can you help me to learn more?
(Other definitions for inferno that I've seen before include "(Hellish) blaze" , "Hellish conflagration" , "blazer?" , "Large and out-of-control fire" , "Huge fire" .)