Thump counter agitatedly (7)
I believe the answer is:
trounce
'thump' is the definition.
(I've seen this before)
'counter agitatedly' is the wordplay.
'agitatedly' indicates an anagram (I've seen this in other clues).
'counter' is an anagram of 'TROUNCE'.
(Other definitions for trounce that I've seen before include "Beat roundly" , "Beat thoroughly on recount" , "Roundly defeat" , "Thump" , "Easily best" .)