Disperse, dissipate (6)
I believe this is a double definition.
'disperse' is the first definition.
(synonyms)
'dissipate' is the second definition.
(I know that dissipate can be written as dispel)
(Other definitions for dispel that I've seen before include "'Disperse, clear away (6)'" , "Dissipate or drive off" , "Drive away and scatter" , "Get rid of" , "Banish, drive away" .)
This clue is a double definition.
'disperse' is the first definition.
(synonyms)
'dissipate' is the second definition.
(thesaurus)
(Other definitions for diffuse that I've seen before include "Circumlocutory" , "Scatter(ed)" , "Spread out, not concentrated" , "Without concentration" , "Radiate; unfocused" .)