Diffuse; scatter (8)
I believe the answer is:
I believe this is a double definition.
'diffuse' is the first definition.
(I know that diffuse can be written as disperse)
'scatter' is the second definition.
(I know that scatter can be written as disperse)
(Other definitions for disperse that I've seen before include "Broadcast" , "Cause to separate and go in different directions" , "'Break up, spread out (8)'" , "Scatter, disseminate" , "Presides so as to scatter" .)