Defeat heavily in counter-revolution? (7)
I believe the answer is:
trounce
'defeat heavily' is the definition.
(I've seen this before)
'counter-revolution?' is the wordplay.
'revolution?' indicates anagramming the letters (I've seen 'revolution' mean this).
'counter' with letters rearranged gives 'TROUNCE'.
'in' acts as a link.
(Other definitions for trounce that I've seen before include "Beat heavily" , "Beat roundly" , "Beat badly in recount" , "Defeat heavily in recount" , "Defeat heavily (in contest)" .)