Atomizer's output (7)
'atomizer's output' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mist that I've seen before include "Thin layer of fog" , "Cloud; thin fog" , "Mizzle; light rain" , "Watery film" , "Slight fog" .)
(Other definitions for aerosol that I've seen before include "Spray producer" , "Sprayer" , "Air-spray" , "See 17 down [CONTAINER]: under pressure" , "Air spray" .)