The Parisian and the socialist spread soap all over (8)
I believe the answer is:
lathered
'spread soap all over' is the definition.
(lathered with soap)
'the parisian and the socialist' is the wordplay.
'the parisian' becomes 'la' (French for the).
'and' says to put letters next to each other.
'socialist' becomes 'red' (socialism is often associated with the colour red).
'la'+'the'+'red'='LATHERED'
(Other definitions for lathered that I've seen before include "Created a froth" , "flogged" , "Soaped as for shaving" .)