Open-air blaze (7)
I believe the answer is:
bonfire
'open-air blaze' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bonfire that I've seen before include "Guy Fawkes conflagration?" , "The - of the Vanities (Tom Wolfe)" , "Source of blazing" , "Signal" , "Large outdoor fire" .)