Fire out of control? Suppose not (7)

I believe the answer is:

inferno

'fire out of control?' is the definition.

'suppose not' is the wordplay.
'suppose' becomes 'infer' (both can mean to deduce or figure out).
'not' becomes 'no' (I've seen this in other clues).
'infer'+'no'='INFERNO'

(Other definitions for inferno that I've seen before include "Where Satan lives and sinners go" , "Hell - conflagration" , "Nine Circles here" , "Large dangerous fire" , "Large uncontrolled fire" .)

I've seen this clue in The Guardian.

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