Notice socialist fume (3,3)
I believe the answer is:
see red
'fume' is the definition.
(I've seen this in another clue)
'notice socialist' is the wordplay.
'notice' becomes 'see' (notice can mean to spot or see).
'socialist' becomes 'red' (socialism is often associated with the colour red).
'see'+'red'='SEE RED'
(Other definitions for see red that I've seen before include "Become enraged" , "Be annoyed" , "Become angry like bull" , "Burst a blood vessel" , "Get furious" .)