Vanish into thin air? (9)
(Other definitions for dissipate that I've seen before include "Be dispelled/dispersed" , "scatter" , "Exhaust" , "Waste (money/energy)" , "Fritter away" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vanish into thin air?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)