Counter-revolutionary defeat? (7)
I believe the answer is:
trounce
'defeat?' is the definition.
(I know that trounce is a more specific form of the action defeat)
'counter-revolutionary' is the wordplay.
'revolutionary' indicates an anagram.
'counter' with letters rearranged gives 'TROUNCE'.
(Other definitions for trounce that I've seen before include "Thump" , "tank" , "Beat heavily" , "Beat resoundingly" , "Wipe the floor with" .)