Thump counter in a frenzy (7)
I believe the answer is:
trounce
'thump' is the definition.
(I've seen this before)
'counter in a frenzy' is the wordplay.
'in a frenzy' indicates anagramming the letters.
'counter' anagrammed gives 'TROUNCE'.
(Other definitions for trounce that I've seen before include "Rout" , "Defeat heavily in recount" , "Defeat decisively" , "Wallop" , "Beat roundly" .)