Blaze set for nine (7)
I believe the answer is:
inferno
'blaze' is the definition.
(I've seen this before)
'set for nine' is the wordplay.
'set' indicates anagramming the letters (instruction to set the letters).
'for'+'nine'='fornine'
'fornine' anagrammed gives 'INFERNO'.
(Other definitions for inferno that I've seen before include "Large and out-of-control fire" , "Intense and uncontrolled fire" , "Hellish conflagration" , "hot spot" , "Terrible fire" .)