To thump counter is out of order (7)
I believe the answer is:
trounce
'to thump' is the definition.
(I've seen this before)
'counter is out of order' is the wordplay.
'is out of order' indicates anagramming the letters.
'counter' with letters rearranged gives 'TROUNCE'.
(Other definitions for trounce that I've seen before include "Aged skip" , "tank" , "Destroy" , "Defeat by large margin" , "Hammer" .)