Like some streets (3-3)
I believe the answer is:
one-way
'like some streets' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for one-way that I've seen before include "This street is single-directional" , "Kind of street where cars shouldn't meet head-on" , "Allowing no return movement" , "Unidrectional" , "Allowing movement in one direction only" .)