Each street is right on the map (4)
I believe the answer is:
east
'right on the map' is the definition.
(I've seen this in another clue)
'each street' is the wordplay.
'each' becomes 'ea' (abbreviation).
'street' becomes 'st' (abbreviation).
'ea'+'st'='EAST'
'is' is the link.
(Other definitions for east that I've seen before include "Chinese, perhaps" , "Bearing of 90 degrees" , "Compass point at 90 degrees" , "Direction taken when going from the US towards Ireland" , "Bearing of ninety degrees" .)