Vanish into thin air? (9)

I think it could be either:

dissipate

evaporate

'vanish into thin air?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for evaporate that I've seen before include "Disappear into thin air" , "Turn from liquid to vapour" , "let off steam" , "go a stage further?" , "Dissolve into the air" .)

I've seen this clue in the Universal and The New York Times.

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