Celebrity of revolutionary traitors (4)
I believe the answer is:
star
'celebrity' is the definition.
(a star is a celebrity or famous person)
'revolutionary traitors' is the wordplay.
'revolutionary' is a reversal indicator (letters revolve around).
'traitors' becomes 'rats' (rat can mean a traitor).
'rats' reversed gives 'STAR'.
'of' is the link.
(Other definitions for star that I've seen before include "Celebrated performer" , "Outstanding actor" , "virtuoso" , "Public figure" , "Lead actor" .)