European meat eaten by socialist, exposed (8)
I believe the answer is:
revealed
'exposed' is the definition.
('reveal' can be a synonym of 'expose')
'european meat eaten by socialist' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'meat' becomes 'veal' (veal is a kind of meat).
'eaten by' indicates putting letters inside.
'socialist' becomes 'red' (socialism is often associated with the colour red).
'e'+'veal'='eveal'
'eveal' inserted into 'red' is 'REVEALED'.
(Other definitions for revealed that I've seen before include "Made clear and visible" , "Discovered" , "Like the religion" , "Shown" , "'Made known, disclosed (8)'" .)