Confront aggressively (6)
I believe the answer is:
accost
'confront aggressively' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for accost that I've seen before include "Stop and pester" , "Tackle" , "Make bold approach to" , "Come boldly up to" , "Approach and address boldly" .)