Approach aggressively (6)
I believe the answer is:
accost
'approach aggressively' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for accost that I've seen before include "Approach and address (someone) aggressively" , "what solicitors do" , "Tackle" , "such as a solicitor might do" , "Make bold approach to" .)