Mist, fume or smoke (6)

I believe the answer is:

vapour

(Other definitions for vapour that I've seen before include "Boast" , "Air-like substance created by heating, like gas" , "Particles suspended in air" , "Substance in the form of a mist, fume or smoke" , "Moisture diffused and suspended in air" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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