Raid; seizure (6)
I believe the answer is:
attack
I believe this clue is a double definition.
'raid' is the first definition.
(I know that raid is a more specific form of the action attack)
'seizure' is the second definition.
(synonyms)
(Other definitions for attack that I've seen before include "Offensive action" , "Assault, offensive" , "Act violently against or criticise strongly" , "Invade; vilify" , "Start a fight or criticise strongly" .)