Counter movement results in defeat (7)
I believe the answer is:
trounce
'defeat' is the definition.
('trounce' can be a synonym of 'defeat')
'counter movement' is the wordplay.
'movement' indicates anagramming the letters.
'counter' is an anagram of 'TROUNCE'.
'results in' acts as a link.
(Other definitions for trounce that I've seen before include "Thump" , "Roundly defeat" , "tank" , "Beat soundly" , "Beat hollow" .)