Attack in street (3)
I believe the answer is:
mug
'attack in street' is the definition.
(to mug someone is to rob them in the street)
This is all the clue.
(Other definitions for mug that I've seen before include "In slang, a person easily deceived" , "Drinking vessel; rob" , "Idiot" , "Drinking vessel for one easily deceived" , "Drinking vessel, by gum" .)