Beat counter revolutionary (7)
I believe the answer is:
trounce
'beat' is the definition.
(trouncing is a kind of beating)
'counter revolutionary' is the wordplay.
'revolutionary' indicates anagramming the letters.
'counter' anagrammed gives 'TROUNCE'.
(Other definitions for trounce that I've seen before include "Beat heavily" , "Roundly defeat" , "Beat thoroughly on recount" , "Beat soundly" , "Beat resoundingly" .)